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Types of refractive errors

The most common types of refractive errors are nearsightedness, farsightedness, astigmatism and presbyopia.

Nearsightedness (also called myopia) is a condition where objects up close appear clearly, while objects far away appear blurry. With nearsightedness, light comes to focus in front of the retina instead of on the retina.

Farsightedness (also called hyperopia) is a common type of refractive error where distant objects may be seen more clearly than objects that are near. However, people experience farsightedness differently. Some people may not notice any problems with their vision, especially when they are young. For people with significant farsightedness, vision can be blurry for objects at any distance, near or far.

Astigmatism is a condition in which the eye does not focus light evenly onto the retina, the light-sensitive tissue at the back of the eye. This can cause images to appear blurry and stretched out.

Presbyopia is an age-related condition in which the ability to focus up close becomes more difficult. As the eye ages, the lens can no longer change shape enough to allow the eye to focus close objects clearly.

 

Who is at risk for refractive errors?

Presbyopia affects most adults over age 35. Other refractive errors can affect both children and adults. Individuals that have parents with certain refractive errors may be more likely to get one or more refractive errors.

What is refraction

 

Signs and symptoms of refractive errors

Diagnosis of refractive errors

 

 

 

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 Age-related Eye Diseases

 

 

 

 

Related Topics

How to choose sunglasses

Kinds of Contact Lenses

Some interesting Eye Facts


 

Reference

http://www.webmd.com/eye-health/features/tips-for-healthy-eyes#3

https://nei.nih.gov/healthyeyes/eyehealthtips

http://kidshealth.org/en/kids/eyes.html#

http://www.allaboutvision.com/nutrition/foods.htm

http://www.bausch.com/vision-and-age/20s-and-30s-eyes/healthy-eyes

http://www.healthline.com/human-body-maps/optic-nerve

https://en.wikipedia.org/wiki/Human_eye

http://www.medicinenet.com/script/main/art.asp?articlekey=10609

http://www.aao.org/eye-health/tips-prevention/top-sunglasses-tips

http://www.aoa.org/patients-and-public/caring-for-your-vision/contact-lenses/advantages-and-disadvantages-of-various-types-of-contact-lenses?sso=y

http://www.everydayhealth.com/vision-center/lenses-and-beyond/contact-lens-options.aspx

https://www.reference.com/science/big-human-eye-59a54b764d3ea21e#

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