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Welcome to the comprehensive medical library of Eye Care Professionals . The information shared below is provided to you as an educational and informational source only and is not intended to replace a medical examination or consultation, or medical advice given to you by a physician or medical professional.

Understanding Focusing ProblemsEnfoque: Problemas

Understanding Focusing Problems

Sharp vision depends on many factors. The parts of the eye work together to refract (bend and focus) light rays. For normal vision, light must focus onto the retina. If the cornea or the eyeball as a whole is not the right shape, light doesn't focus correctly and vision is blurry. Common focusing problems include myopia, hyperopia, and astigmatism.

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Emmetropia (normal vision) is maintained when light focuses on the retina.

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Hyperopia (farsightedness) occurs when light focuses behind the retina. Nearby objects appear blurry.

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Myopia (nearsightedness) occurs when light focuses in front of the retina. Distant objects appear blurry.

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Astigmatism occurs when light focuses in more than one place. Both nearby and distant objects are distorted.

If You're Over 40

With age, muscles around the lens become stiff. Stiffening of these muscles makes it harder for the lens to accommodate (change shape to focus light). This leads to presbyopia (difficulty focusing on nearby objects).

Date Last Reviewed: 2005-08-25T00:00:00-06:00

Date Last Modified: 2005-08-25T00:00:00-06:00