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Sensations of ocular dryness

Sensations of ocular dryness occur when the precorneal tear film becomes unstable and breaks up more rapidly than normal, leaving areas of the cornea uncovered.
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A cataract is an opacity or cloudiness that develops in the crystalline lens of the eye or in its envelope and progressively blurs the vision.
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Refractive errors

A refractive error is an error in the focusing of light by the eye and is a frequent reason for reduced visual acuity.
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