Refractive Errors

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Presbyopia

A person with presbyopia has difficulty focusing on close objects. It is similar to hyperopia, but the underlying cause is different.



In presbyopia, the crystalline lens has become less flexible and the eye muscles that support the lens and allow it to accommodate have weakened. The crystalline lens is composed like an onion. The nucleus is surrounded by the cortex, and the cortex is surrounded by the lens capsule. The lens is an elastic structure that changes shape, or acco...Read the full article