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Online sight test

Test the quality of your vision.

 

Vision is subject to normal changes such as the aging process and can change over time. As this is a slow process, you may not recognize the changes. That’s why it's important to check your eyes regularly in order to understand whether further tests by an optometrist might be required. The first sign that our vision is deteriorating is not always blurred or unfocused vision. Headache or eye strain in the evening could also indicate defective vision.

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How often should you have your eyes tested?

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Adults (without existing or known eye problems) should have their eyes tested regularly

  • between the ages of 20 and 39 at least three times during this period

  • from the age of 40 onwards: once every 2-3 years

  • from the age of 65 onwards every 1-2 years.

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Available online tests:

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The Visual Acuity Check

The goal of this test is to find out clarity (Acuity) of your vision. Visual acuity (VA) is a measure of the ability of the eye to distinguish shapes and the details of objects at a given distance. It is important to assess VA in a consistent way in order to detect any changes in vision. Even if you have perfect acuity (20/20), this doesn’t mean your vision is without problems. This test does not take into consideration peripheral vision, ability to focus, depth perception, color vision. It is merely one part of the complete eye exam.This is not intended as a replacement for the tests conducted by your optician. However, you do receive an initial impression of the quality of your vision. During eye examinations, the refractive power required to correct defective vision is determined without accommodation (the eye's automatic adaptation to various distances).

 

Symptoms:

  1. Blurry vision that gets worse when you look at distant objects. You may have very good close vision - myopia

  2. Blurry vision when you look at close up objects. Near and far objects may both look fuzzy -   hyperopia

  3. You might have blurry or double vision at any distance - astigmatism

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The Contrast Vision Check

The goal of this test is a realistic assessment of how well we see large faint objects around us. It measures the least amount of contrast needed to detect a visual stimulus. Many instances in which losses in contrast sensitivity were detected when visual acuity (one point on the contrast sensitivity function) was normal have been reported.  The testing of contrast sensitivity on a regular basis is key to detecting early signs of diseases such as AMD, Glaucoma, and Cataracts.   Therefore, contrast sensitivity testing enables the clinician to diagnose selective deficits in visual processing at an earlier stage than is possible with conventional testing methods.

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Symptoms:

  1. Driving at night, or in foggy, rainy or glare conditions, and accurately determining distances

  2. Trouble reading newspaper where the print contrast against the paper background is poor

  3. Distinguishing objects when they are similar in color to their background, like finding a black wallet in a black purse; determining when your coffee is near the top when pouring it into a black mug; or picking out black socks in a shadowy drawer

  4. Stepping off an unmarked curb or seeing steps clearly

  5. Distinguishing facial features

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Lense clouding test

A cataract is a clouding of the eye's natural lens, which lies behind the iris and the pupil. Over time, a cataract may grow larger and cloud a bigger portion of the lens, making it harder for you to see. Cataracts can decrease image contrast. This happens because the cataract can cause light scattering and glare.5 Cataracts are common in older people. In the United States, about half of all people age 80 and older have cataract.  You are at increased risk of developing cataracts if: You are over the age of 55, have a family history of cataracts or have diabetes

 

Symptoms:

  1. Reduced visual clarity

  2. Hazy vision that might be worse in bright light

  3. Weaker vision at night, particularly when driving; trouble seeing movement, details, or objects (especially street signs)

  4. Blinding or uncomfortable glare (halos) from automobile headlights or bright sunlight

  5. A need for brighter light for reading or see detail

  6. Colors look faded or yellow

  7. Double or triple vision (images overlap) in one eye only

  8. A normally dark pupil looks milky white or opaque (advanced cases)

  9. Painful inflammation and pressure within the eye (very advanced case)

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Colour vision test

The Ishihara test is used to detect colour blindness, an anomaly responsible for colour vision deficiencies. Test gives a quick and accurate assessment of color vision deficiency of congenital origin, with most cases are characterized by a red-green deficiency. The testing of color deficieny on a regular basis is key to detecting early signs of diseases such as AMD, Glaucoma,  Cataracts and Diabetes.

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Symptoms:

  1. An enhanced sense of smell.

  2. Enhanced night vision.

  3. Bright light sensitivity.

  4. Difficulties reading colored work pages.

  5. Decreased attention span when coloring.

  6. Exclusively coloring with the wrong colors.

  7. Head or eye ache when looking at red on green or green on red backgrounds.

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Visual Field Check

The visual field, described as the space in which we can perceive light and recognize objects, can be limited by various eye diseases, especially neurological causes. Since such diseases can worsen gradually also the visual field can be affected over time. An intact central visual field is important for instance reading a book or working in the office. The peripheral visual field provides us important information e.g., while driving a car. The visual field check provides a grid-like structure with a central fixation dot and is designed based on the clinically used Amsler test. This test is used in near distance of ~30cm in front of the eye and can screen for central visual field issues. Irregularities can appear as distorted, missing or interrupted lines from the grid. Important: While using your individual phone or screen, the size of the Amsler grid can change from the recommended size.

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Central Vision Loss Test

Among older adults in industrialized nations, age-related macular degeneration (AMD) is the primary cause of visual impairment and blindness.1 It affects the macula, an oval-shaped area near the center of the retina that is important for central vision or seeing straight ahead of us.  If the macula is damaged, it can cause a blurry or dark spot in the middle of your field of vision.  Central scotomas are some of the most devastating visual field defects because they can make reading, driving and recognizing faces difficult or impossible.

 

Symptoms:

  1. Center of your vision field becoming distorted, blurry or dark.

  2. There is bleaching and fading of colors in the field of vision.

  3. There is greying of the vision.

  4. There are blank spots in the center of the visual field.

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Peripheral Vision Loss Test

Your peripheral vision is your side vision, the ability to see things outside of your direct line of sight. You use peripheral vision when you see something out of the corner of your eye. Peripheral vision is important because it allows you to see objects around you without the need to turn your head or move your eyes. You use this ability for many tasks, such as driving and playing sports.  When someone loses their peripheral vision, it’s called peripheral vision loss, or tunnel vision. 

 

Symptoms:

  1. Outer edges of your vision becoming blurry or dark.

  2. Difficulty seeing at night.

  3. Blurry vision.

  4. Blindspot in your vision.

  5. Sensitivity to light.

  6. Bumping into objects or people.

  7. Not seeing something until it is right in front of you.

  8. Seeing halos or glares around lights.

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When the visual acuity is so poor that the largest optotypes cannot be named, generally the clinician brings the chart closer to the patient, but rarely closer than 1 meter. If the largest optotype cannot be read at the close distance, testing visual acuity with optotypes is abandoned and the usual practice is for the clinician to next ask the patient to count the fingers on a hand held at a close distance.

The Berkeley Rudimentary Vision Test was designed to provide a rational system for quantifying very poor levels of visual acuity (i.e., spatial vision) with methods that are simple and easy to apply in any clinical environment, using reasonably fine systematic increments down to the practical limits of spatial vision.

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