what is visual acuity

Full Explanation - What Is Visual Acuity

What Is Visual Acuity?

Visual acuity, also known as clarity of vision or sharpness of vision, is a person’s ability to see small detailed. A visual acuity score is the result of a vision test performed by an optician or eye doctor. It is usually expressed as a fraction that measures a patient’s ability to see an object from 20 feet away compared to a person with normal vision who can see objects clearly from a longer distance.

For example, 20/20 vision means that you can see an object clearly from 20 feet away. 20/40 means that you need to be 20 feet away to see clearly what a person with normal vision can see from 40 feet away. Then the eye doctor uses your visual acuity to help determine your eyeglasses prescription.

Visual acuity is dependent on a combination of optical and neural elements including: the health and functionality of the retina, how sharply the retina forms images, how well your brain can interpret sensory inputs.

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In addition, refractive errors such as nearsightedness, farsightedness and astigmatism can also cause poor acuity because refractive errors are visual impairments that affect the way light is bent, or refracted in your eyeball, resulting in decreased visual acuity.

What Are the Purposes of Visual Acuity Test?

If you feel you are experiencing a vision problem or your vision has changed, you may need an eye exam. A visual acuity test is one part of a comprehensive eye exam. Children frequently take visual acuity tests. Early testing and detection of vision problems can prevent issues from getting worse.

How Is the Visual Acuity Test?

An eye doctor or optician can perform a visual acuity test. During the eye test, you will be seated a certain distance from the visual acuity chart. Elements such as distance from the test chart and lighting conditions must be standardized.

Then the patient will cover their right or left eye and read the visual acuity chart, staring at the top and proceeding downwards until they can no longer distinguish the letters. Next, switch eyes and repeat the same processes. The doctor will use the line with the smallest visible letter size to give you the eye test results.

Visual acuity score is expressed as a fraction such as 20/20. If your visual test result is not 20/20, you may need corrective eyeglasses, contact lenses, or surgery. You may also have an eye condition, such as an eye infection or injury, that needs to be treated. Your doctor will tell you the test results as well as any treatment or correction that might be necessary.

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To sum up, this post has shown what visual acuity is and shows the purposes of the visual acuity test. If you have any different ideas for visual acuity, share them in the comment zone. If you have any problems with prescription glasses, send an email to service@koalaeye.com and we will reply to you as soon as possible.

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