What is astigmatism test. Comprehensive Guide to Astigmatism Testing: Online and At-Home Methods Explained

20.09.202328.06.2023 by alexxlab

How can you test for astigmatism online. What are the basics of at-home astigmatism testing. How do online eye exams for astigmatism work. What are the differences between online and at-home astigmatism tests. How accurate are online astigmatism tests compared to in-office exams.

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Understanding Astigmatism: Causes and Symptoms

Astigmatism is a common vision condition that affects millions of people worldwide. It occurs when the cornea or lens of the eye has an irregular shape, causing light to focus on multiple points on the retina instead of a single point. This results in blurred or distorted vision at all distances.

What causes astigmatism? The primary causes include:

Genetic factors
Eye injuries or surgeries
Keratoconus (a condition that causes the cornea to thin and bulge)
Certain eye diseases

How do you know if you have astigmatism? Common symptoms include:

Blurry or distorted vision at all distances
Eyestrain or headaches, especially after reading or using digital devices
Difficulty seeing clearly at night
Squinting to try and focus

The Rise of Online Astigmatism Testing: Convenience and Limitations

In recent years, online astigmatism testing has gained popularity due to its convenience and accessibility. Can you really test for astigmatism online? The answer is yes, but with some caveats.

Online tests can provide a preliminary assessment of your vision and may detect moderate to severe cases of astigmatism. However, they are not a substitute for a comprehensive eye exam performed by an eye care professional.

What are the benefits of online astigmatism testing?

Convenience: You can take the test from the comfort of your home
Quick results: Most online tests provide immediate feedback
Cost-effective: Online tests are generally less expensive than in-office exams
Accessibility: Useful for those who live in remote areas or have limited access to eye care professionals

Despite these advantages, online tests have limitations. They cannot provide a comprehensive assessment of your eye health or detect other eye conditions that may be contributing to vision problems.

At-Home Astigmatism Testing: DIY Methods for Initial Screening

At-home astigmatism testing offers a simple way to screen for potential vision problems. While these tests are not diagnostic, they can help you determine if you should seek professional eye care.

The Dial Test: A Simple At-Home Screening Method

How does the Dial Test work? Follow these steps:

Find a dial diagram online (a series of black lines positioned in a semi-circle)
Stand about 10 feet away from the diagram
Cover one eye and observe each line slowly
Repeat the process with the other eye

If you have astigmatism, some lines may appear gray or lighter than others from certain angles, despite all being black.

The Line Test: Another DIY Screening Option

How is the Line Test performed?

Find an image with several squares made up of lines set at different angles
Stand 10 feet away from the image
Look at each square slowly, covering one eye at a time
Note if any lines appear gray or distorted

If you notice distortions or gray areas in the lines, it may indicate the presence of astigmatism.

Navigating Online Eye Exams: A Step-by-Step Guide

While in-person exams remain the gold standard for diagnosing and prescribing corrective lenses for astigmatism, online eye exams can provide a convenient alternative. How do you take an online eye exam?

Step 1: Gather Your Equipment

What do you need for an online eye exam?

A computer with a stable internet connection
A smartphone
Adequate lighting in your testing area
A tape measure or ruler to measure screen distances

Step 2: Choose a Reputable Online Testing Service

How do you select a reliable online eye exam provider?

Research customer reviews and expert opinions
Check if the service is approved by regulatory bodies
Compare pricing (most tests should cost between $40 and $60)
Ensure the service can provide a prescription upon completion

Step 3: Set Up Your Testing Environment

How should you prepare your space for the online exam?

Choose a quiet, well-lit room
Measure and mark the required distances for viewing test charts
Ensure your computer and smartphone are fully charged
Close other applications to prevent distractions

Step 4: Follow Test Instructions Carefully

Why is it crucial to follow instructions precisely? Accurate results depend on proper test execution. Pay attention to details such as:

Correct viewing distances
Proper positioning of your devices
Accurate input of your responses

Online vs. At-Home Tests: Understanding the Differences

While both online and at-home tests can provide initial screening for astigmatism, they differ in several key aspects. How do these testing methods compare?

Online Tests:

Utilize digital technology and algorithms
May involve interaction with eye care professionals
Can potentially provide prescriptions for corrective lenses
Require specific equipment and setup

At-Home Tests:

Use simple, non-digital methods
Do not involve professional guidance
Cannot provide prescriptions
Require minimal equipment (usually just printed charts)

Which method is more accurate? Online tests generally provide more reliable results than at-home tests, but neither can match the accuracy of an in-office comprehensive eye exam.

The Accuracy Debate: Online Tests vs. In-Office Exams

As online vision testing technology advances, a debate has emerged regarding its accuracy compared to traditional in-office exams. How do these methods stack up?

Advantages of In-Office Exams:

Comprehensive assessment of eye health
Ability to detect other eye conditions
More precise measurements for prescriptions
Direct interaction with eye care professionals

Limitations of Online Tests:

Cannot assess overall eye health
May miss subtle vision problems
Limited ability to detect certain eye diseases
Potential for user error affecting results

What do studies say about online test accuracy? Research indicates that while online tests can detect significant refractive errors, including moderate to severe astigmatism, they may not be as reliable for detecting minor vision problems or prescribing highly accurate corrective lenses.

When to Seek Professional Eye Care: Beyond Online Testing

While online and at-home astigmatism tests can be useful screening tools, they should not replace regular comprehensive eye exams. When should you see an eye care professional?

If you haven’t had a comprehensive eye exam in over two years
If you’re experiencing persistent vision problems or eye discomfort
If online or at-home tests suggest you may have astigmatism
If you have a family history of eye diseases
If you have underlying health conditions that may affect eye health (e.g., diabetes)

How often should you have a comprehensive eye exam? The American Optometric Association recommends:

Adults (18-64): Every two years
Adults (65+): Annually
Children and teenagers: Annually or as recommended by their eye doctor

The Future of Astigmatism Testing: Emerging Technologies and Trends

As technology continues to advance, the landscape of astigmatism testing is evolving. What are some emerging trends and technologies in this field?

Artificial Intelligence in Vision Testing

How is AI changing astigmatism testing? AI algorithms are being developed to:

Analyze retinal images for early detection of eye diseases
Improve the accuracy of online vision tests
Assist in creating more precise corrective lens prescriptions

Virtual Reality (VR) and Augmented Reality (AR) in Eye Exams

How might VR and AR technologies impact astigmatism testing?

Creating immersive testing environments for more accurate results
Simulating real-world vision scenarios to assess visual function
Enhancing remote eye exams through AR-guided testing

Smartphone-Based Vision Testing Apps

What advancements are being made in smartphone vision testing?

Development of more sophisticated apps for at-home vision screening
Integration of smartphone cameras for corneal topography
Improved accuracy through better camera technology and processing power

While these technologies show promise, it’s important to note that they are still in development and may not yet match the accuracy of traditional in-office exams.

Managing Astigmatism: Treatment Options and Lifestyle Adjustments

Once astigmatism is diagnosed, either through online testing or an in-office exam, what are the available treatment options?

Corrective Lenses

How do corrective lenses help with astigmatism?

Eyeglasses with cylindrical lenses compensate for corneal irregularities
Toric contact lenses provide correction specifically designed for astigmatism
Orthokeratology (Ortho-K) lenses temporarily reshape the cornea during sleep

Refractive Surgery

What surgical options are available for astigmatism correction?

LASIK (Laser-Assisted In Situ Keratomileusis)
PRK (Photorefractive Keratectomy)
SMILE (Small Incision Lenticule Extraction)

These procedures reshape the cornea to correct the refractive error causing astigmatism.

Lifestyle Adjustments

What lifestyle changes can help manage astigmatism symptoms?

Taking regular breaks when using digital devices (20-20-20 rule)
Ensuring proper lighting for reading and close-up tasks
Maintaining good posture to reduce eye strain
Staying hydrated to prevent dry eyes, which can exacerbate astigmatism symptoms

Remember, the best treatment plan for astigmatism will depend on the severity of the condition, your lifestyle, and other individual factors. Consult with an eye care professional to determine the most suitable approach for your specific needs.

Frequently Asked Questions About Astigmatism Testing

As we explore the world of astigmatism testing, several questions often arise. Here are answers to some of the most frequently asked questions:

Can astigmatism go away on its own?

Astigmatism is typically a stable condition that doesn’t worsen or improve significantly over time. In most cases, it doesn’t go away on its own and requires correction through glasses, contact lenses, or surgery.

Is it possible to have astigmatism in only one eye?

Yes, it’s possible to have astigmatism in only one eye, although it’s more common to have it in both eyes. The degree of astigmatism can also vary between eyes.

Can children have astigmatism?

Yes, children can have astigmatism. In fact, many children are born with some degree of astigmatism, which may improve as they grow. Regular eye exams are important for children to detect and correct vision problems early.

How often should I update my glasses prescription for astigmatism?

Generally, it’s recommended to have your eyes checked and potentially update your prescription every 1-2 years. However, if you notice changes in your vision, you should consult an eye care professional sooner.

Can astigmatism cause headaches?

Yes, uncorrected astigmatism can cause headaches, especially after prolonged periods of visual tasks like reading or using digital devices. This is due to the extra effort your eyes make to focus clearly.

Is astigmatism considered a disability?

Astigmatism is not typically considered a disability as it can usually be corrected with glasses, contact lenses, or surgery. However, severe cases that significantly impact daily activities might be considered a visual impairment.

Can diet or eye exercises improve astigmatism?

While a healthy diet is important for overall eye health, there’s no scientific evidence that specific foods or eye exercises can cure or improve astigmatism. The shape of the eye causing astigmatism cannot be changed through diet or exercises.

Understanding astigmatism and the various testing methods available is crucial for maintaining good eye health. While online and at-home tests offer convenience and initial screening capabilities, they should not replace regular comprehensive eye exams performed by eye care professionals. These in-office exams remain the most accurate way to diagnose astigmatism and other eye conditions, ensuring you receive the most appropriate treatment for your vision needs.

As technology continues to advance, we can expect to see improvements in online and remote vision testing capabilities. However, the importance of professional eye care cannot be overstated. Regular eye exams not only help detect and manage conditions like astigmatism but also play a crucial role in maintaining overall eye health and preventing potential vision problems.

Remember, your vision is precious. If you suspect you have astigmatism or are experiencing any vision issues, don’t hesitate to seek professional help. Early detection and appropriate treatment can make a significant difference in your quality of life and long-term eye health.

Astigmatism Testing: Online Test for Symptoms & Causes

Fact Checked

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Last Updated Dec 12, 2022

Can You Test for Astigmatism Online?

Astigmatism is a vision condition in which a person experiences blurring due to an irregular cornea shape or lens curvature. This can cause blurring regardless of distance, with your exact level of visual acuity sometimes varying by the angle at which you look at an object.

Generally speaking, the best way to test for astigmatism is to receive a comprehensive eye exam from a medical professional. The traditional way to do this is in-office, although online tests have grown in popularity.

While expert opinions differ on how online tests compare to in-office exams, reputable online tests can at least catch moderate or worse levels of astigmatism. This can lead to a corrective eyewear prescription that helps correct astigmatism.

The Basics of At-Home Astigmatism Testing

At-home astigmatism testing, where you conduct the exam yourself, is not going to get accurate enough data points to determine what prescription of glasses or contacts you need to correct astigmatism. However, it can help you determine if you have astigmatism.

This can make an online astigmatism test a good starting point if the help of a medical professional isn’t available. A few semi-standardized at-home tests can easily be found online.

These are two types of at-home astigmatism testing:

Dial Test

For this test, you first find an example of a dial diagram, which is a series of black lines positioned in a semi-circle, like the one here. Looking at the chart from about 10 feet away, you slowly observe each line, covering one eye and then repeating the same test covering your other eye.

If you have astigmatism, the lines may appear gray or otherwise lighter than each other from certain angles despite the fact they are all dark black.

Line Test

This is a similar test, in which several squares made up of lines set at different angles are observed. Again, looking at the squares from 10 feet away and testing one eye at a time, look at each square slowly.

If the lines composing the squares look gray or distorted, you may have astigmatism.

How to Take an Online Eye Exam

While an in-person astigmatism test is recommended to get the high level of prescription accuracy needed to effectively correct astigmatism, you can get a prescription from online eye exams.

If you would like to take an online exam, follow the steps outlined below.

Get a Computer, Smartphone & Stable Internet Connection Most accurate online eye tests require two digital devices, as you will have to position screens at multiple distances for your testing. This is usually done with a computer and a smartphone. You will also need a stable internet connection, so you can receive instructions and potentially talk with a medical professional.You may also need to download a testing company’s app onto the devices you intend to use, depending on the service you choose. This is not unusual, but make sure you are downloading the real app from a reputable company.
Make an Account With a Reputable Testing Service You have a few options to choose from when getting an online vision test. Look at customer reviews and read expert opinions.Be wary of services that charge large amounts for their tests. A report written by CNN’s Jacqueline Howard explored a service from Opternative that could provide a meaningfully accurate online test for between $40 and $60. Most tests should not cost much more than that.
Also, check to make sure the service you choose can give you a prescription upon completion of the test. If they don’t, you will need to pay an eye professional for further testing.
Follow All Instructions Once you have the proper equipment and an account set up, follow the instructions outlined by the company so you can begin your test. It is important you follow all instructions closely. Otherwise, you may get inaccurate results from your testing, which could lead to a useless prescription.When your test is complete, the information will then be reviewed by a medical professional who will provide you with a corrective eyewear prescription.
Save All Provided Prescription Information Once you have a prescription from a medical professional, you can effectively get glasses or contacts in the same way you could with a prescription from an in-office visit. Save this prescription information for future use.

Are Online & At-Home Eye Tests Accurate?

The accuracy of online eye testing is somewhat debated.

Again, it is important to distinguish that an online eye exam is not the same as a comprehensive eye exam. Online vision tests, even from reputable companies, can test the basics of your visual acuity and help determine what corrective eyewear could benefit you.

A comprehensive eye exam, performed by an optometrist or ophthalmologist in their office, will thoroughly test your eye health and visual acuity. This isn’t just about getting you a prescription for glasses or contacts. It’s about assessing your overall eye health and checking for any eye diseases or conditions.

If certain issues are detected, supplementary testing may be recommended. Comprehensive eye exams are essential for your vision and your overall health.

For contact and glasses prescriptions only, online vision tests that are conducted correctly by a reputable company seem to produce results comparable to those of an in-office vision test. Minor differences are possible. For example, a CNN report noted that subtle astigmatism may be missed in online tests.

Broadly, online tests can produce accurate enough results that the prescriptions provided can help a person see a dramatic improvement in their vision.

At-home testing, where a patient only looks at eye charts with no medical professional or computer-run assistance, is rudimentary. It can help you to quickly check if you may have a notable level of astigmatism or other problems with your visual acuity, but that is largely the limit of its reach.

You should seek a more comprehensive test following the online exam to better understand what specific vision problems you may have and what corrections your eyes need.

Online Astigmatism Testing FAQs

Can I test myself for astigmatism online?

Yes, it’s possible to use an online test for astigmatism, but its effectiveness is limited. An online test may give you an idea of whether you have astigmatism, but you should see a professional in person to assess its severity and get a prescription to correct it.

How can I test myself for astigmatism?

At-home testing for astigmatism includes either a dial or a line test. These tests can help you determine if you may have astigmatism, but they are very limited in their capabilities.

You can easily miss mild astigmatism with these tests. If you do detect the signs of astigmatism, you will still need a medical professional to get an accurate prescription for corrective eyewear like glasses or contacts.

What are the signs of astigmatism?

Astigmatism is a type of refractive error where you experience blurring in your vision regardless of distance as a result of irregularities in your eye’s shape. These are other common symptoms of astigmatism:

Eyestrain
General eye discomfort
Problems seeing at night
Headaches
Needing to squint to see clearly

Can you have 20/20 vision with astigmatism?

Yes, it’s possible to have uncorrected 20/20 vision with mild astigmatism.

Can LASIK fix astigmatism?

Generally, yes. LASIK is able to correct most cases of astigmatism. In a LASIK consultation, your potential surgeon will map the surface of your cornea to determine what level of correction LASIK can give you if you are a candidate.

References

Astigmatism. American Optometric Association.
Home Vision Tests for Children and Adults. (March 2022). American Academy of Ophthalmology.
Test Yourself for Astigmatism in 3 Easy Steps. Vision and Eye Health.
Influence of Different Types of Astigmatism on Visual Acuity. (July–September 2017). Journal of Optometry.
The Doctor Will ‘See’ You Now: Online vs. In-person Vision Tests. (March 2018). CNN.
What Is Astigmatism? Symptoms, Causes, Diagnosis, Treatment. (February 2022). American Academy of Ophthalmology.
Comprehensive Eye Exams. American Academy of Ophthalmology.
Comparative study of the outcome of LASIK in Moderate Versus High Astigmatism. (April 2014). Investigative Ophthalmology & Visual Science.

The information provided on this page should not be used in place of information provided by a doctor or specialist. To learn more, read our Privacy Policy and Editorial Policy pages.

Astigmatism test online: Test yourself in 4 easy steps

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Medically reviewed by Jakub Odcházel, DiS., Chief Optician, on 19 May 2023.
Written by Maria Chiara Tarsia

Did you know that about 70% of all

glasses wearers are astigmatic? Maybe you are one of them. Test your eyesight now with our at-home astigmatism test!

What is astigmatism?

How is astigmatism diagnosed?

How to test yourself for astigmatism online

What are the symptoms of astigmatism?

Can astigmatism get worse?

Are there astigmatism glasses?

What are the best contact lenses for astigmatism?

Learn more about eye health

What is astigmatism?

Astigmatism is a common vision defect that causes difficulties in near and far vision, headaches and blurry vision. It can affect people of any age, and often those affected are also short-sighted or farsighted. In these cases, it takes the name of myopic astigmatism or hypermetropic astigmatism.

The cause of this impairment is found in the non-homogeneous curvature of the astigmatic cornea.

Take a look at our infographic below, which highlights the difference between a typical cornea and a cornea affected by astigmatism:

Normally the cornea should appear spherical, with a shape that resembles a football. When astigmatism occurs, it appears more squashed, like a rugby ball.

How is astigmatism diagnosed?

An eye exam performed by an optician or an ophthalmologist can determine whether you suffer from astigmatism.

How to test yourself for astigmatism online

You can use a simple self-test to check if you have astigmatism while you are waiting for your eye test appointment. Remember that self-tests should be considered as a simple tool to satisfy personal curiosity and not as an actual diagnosis.

The following type of astigmatism self-test is called a dial test.

How to use the dial test

Place yourself at about

35–40 cm from the picture.

Look at the image with one eye covered at a time.

Then, look again at the image with both eyes.

If you wear glasses, repeat the test both with and without them.

How to understand the results

If the rays appear blurry or unclear in one or more directions, this could indicate you have astigmatism.

If you detect differences in lines even when wearing your glasses, you should have your glasses and your eyes checked again because your prescription lenses can be incorrect or outdated.

In both cases, you should visit your optician or ophthalmologist.

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A wide range of high-quality contact lenses for astigmatism are waiting for you.

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What are the symptoms of astigmatism?

The corneal deformation causes the light to be refracted incorrectly. Round objects could, for example, appear oval due to the distortion. But not only that. The constant wrong refraction of the light causes our eyes and brain to exert themselves.

Sometimes – our brain being the wonderful machine that it is – we might even not register this strain, but simply feel more tired than normal. Well, at least until we find the perfect prescription.

No wonder so many people don’t know they are astigmatic until they get tested for it.

Here are the most common symptoms of astigmatism. If you are astigmatic, you might experience all of them or just some:

Distorted or fuzzy images

Eye fatigue and/or visual discomfort

Frequent squinting

Blurred vision both from afar and up close

Headache

Watery eyes

Impaired vision at night

Can astigmatism get worse?

Yes, especially if it isn’t corrected properly. Other reasons can be congenital or due to trauma, dry eye syndrome or because of bad habits

such as excessive squinting or erroneous use of glasses or contact lenses. Sometimes, though, it can get worse for no reason at all. This is why eye check-ups are fundamental and must be repeated periodically.

More often than not, astigmatism remains stable or changes gradually as we age (for example, when the cornea becomes increasingly oddly shaped due to a natural loosening of our muscle tone). When these changes occur, it is likely that our prescription needs adjustment.

In general, according to researchers, in most cases astigmatism remains relatively stable until 50 years of age, increasing progressively faster after 60.

Are there astigmatism glasses?

Yes, astigmatism can be easily corrected with glasses that mount single-vision toric lenses. Toric lenses are available both for glasses and contact lenses. They differ from those for simple myopia and hyperopia.

At Lentiamo you can find different types of lens materials and special coatings to suit your needs. An updated glasses prescription is all you need. Simply choose your favourite frame from our wide selection of models from the best eyewear brands, fill in your parameters (you can find them in your eye prescription) and wait for delivery!

How do toric contact lenses work?

Toric contact lenses can correct both myopia and hyperopia at the same time as astigmatism. These lenses for astigmatism have three different parameters that are created with different angled curvatures.

The Power corrects myopia or hyperopia and the other two, Cylinder and Axis, correct astigmatism. These lenses have special features that allow them to remain in place and avoid shifting or rotating inside the eye, and thus have better stability in order to allow the

incorrectly deviated meridians to fall correctly on the retina.

Here are some of the best toric contact lenses for astigmatism:

Buy Acuvue Oasys for Astigmatism

Buy 1-DAY Acuvue Moist for Astigmatism

Buy Air Optix Plus Hydraglyde for Astigmatism

Learn more about eye health

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Astigmatism test – Siemens Star test – online vision test on the website of JSC “MAKDEL-Technologies”

ATTENTION! If you are unhappy with the test result or have questions, contact your ophthalmologist. Online tests are not a medical examination and cannot replace a visit to a doctor.

Even if you do not have vision problems and do not use corrective means, it is recommended to check your visual acuity regularly. Usually, verification is carried out using various tables (Orlova, Golovin, Sivtsev). But ophthalmologists also use other tests, including the Siemens Star.

Explanation of the results

If instead of individual rays a person sees a solid gray mass, then he has myopia or farsightedness. With myopia, you need lenses with “minus” diopters, and with farsightedness – with “plus”.

In the presence of astigmatism, the rays will change (thicken, bend, change contrast), and an ellipse or a shapeless figure will appear in the center of the image. In addition, the “Siemens star” will be distorted in direct proportion to the degree of refractive error.

Normally, the subject sees the following picture:

all rays are straight and even;
all lines merge at a distance of about 2.5 centimeters from the center of the circle, forming a gray background;
in the central part of the stripe are painted white and form a circle;
The circle changes size (reduces or enlarges) when the distance to the table changes.

You can take the test on a computer at home, but please note that the result may vary depending on the general condition of the person, the time of day, the degree of moisture in the eyes, the brightness of the monitor and the intensity of the lighting. Therefore, it is recommended to check visual acuity several times. If the result of each test indicates a pathology, then it is necessary to visit an ophthalmologist.

What does testing reveal?

The Siemens Star is named after its creator (an ophthalmologist). It looks like a circle with a diameter of 10 centimeters. There are 54 black rays on a white background. They converge in the center, have the same thickness and length.

The test allows you to detect:

myopia (myopia) – a visual defect in which the length of the eyeball increases, due to which a person sees well only what is within the outstretched arm;
farsightedness (hypermetropia) – a refractive error in which the size of the eyeball decreases, as a result, a person does not see closely located objects;
astigmatism is a visual pathology caused by a curvature of the optical surface of the eyeball, lens or cornea, which leads to a distortion of the visual image.

The test is usually performed if an ophthalmologist suspects visual pathology.

How is testing done?

For the most accurate result, it is necessary to test in a well-lit room. It is important that the table is clearly visible, there should be no reflections and glare.

Before the test, the subject removes glasses or contact lenses (if he wears them) and stands at a distance of 5 meters from the table. First, he covers one eye with his hand and carefully examines the circle for two or three seconds, then performs the same actions, closing the other eye. At the end of the test, the subject looks at the table with both eyes.

Online astigmatism test |Doctorplus Medical Center, Surgut

Or call us at +7 (3462) 55 00 03

You receive confirmation of the appointment in electronic form

Come to the appointment at a convenient time for you

The essence of this disease is that the cornea (sometimes the lens) does not have the shape of a sphere. The cornea and the lens in the nome have a smooth surface of the sphere, and with astigmatism their sphericity is violated, due to which the cornea has different curvature in different directions. As a result, a person suffering from this disease sees a distorted picture, where some lines are blurry, while others are clear. Everyone has some degree of astigmatism. The bottom line is, does this interfere with the sharpness and quality of vision?

Testing for astigmatism No 1

2. If some lines seem darker to you, you probably have astigmatism.

Astigmatic Testing No 2

1. Cover both eyes in turn.

2. Astigmatism disorders, with a high probability, you do not have if you see identically black ruled squares.

3. You have astigmatic disorders if one of the squares looks the most gray (or several of them).

Testing for astigmatic disorders No. 3

at the Siemens star against the background of the peripheral part to the central, black rays are collected. The latter overlap with each other, they spread out, not reaching the central part, if the vision is fuzzy. They seem to merge with the background in an excessively small area. But the rays again suddenly become distinct with great precision, in accordance with how they then move towards the center. At what the picture is transformed into a negative. Instead of a white background, a black beam appears and vice versa.

If the examined patient has normal vision, then they may experience this effect when the image is brought very close to the organ of vision. Due to the fact that the resolution of the retina is very, very limited, at a large distance from the image, the rays for them will look like a merging mass of gray. When viewed by people with 100% vision of the image from a distance of 500 cm, the rays merge to 1/2 of their own length – at the moment when the distance to the central part is 2. 5 centimeters (provided that the entire length of the beam is 5 centimeters).

This test for astigmatism allows you to perfectly see the permanent change in visual acuity, while these changes are partly dependent on the control of the will.

If the visual organ is with astigmatic disorders, then the line of clear visibility has a variety of complex shapes (for example, an ellipse), and not a circle at all.

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