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Refractive Conditions

Farsightedness

Also called hyperopia.  Condition in which the length of the eye is too short, causing light rays to focus behind the retina rather than on it, resulting in blurred near vision. Additional symptoms include eyestrain and squinting.

 

Nearsightedness

Also called myopia. Condition in which the length of the eye is too long, causing light rays to focus in front of the retina rather than on it, resulting in blurred distance vision. Additional symptoms include eyestrain, poor night vision and squinting.

 

Astigmatism

Condition in which the cornea's curvature is asymmetrical (the eye is shaped like a football or egg instead of a baseball); light rays are focused at two points on the retina rather than one, resulting in blurred vision. Additional symptoms include distorted vision, eyestrain, and shadows on letters, squinting and double vision.

 

Presbyopia

Condition in which the aging eye is unable to focus on near objects. It typically begins around age 40. Additional symptoms include eyestrain, headaches and squinting.

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