Myopia is also known as near-sightedness or short-sightedness. In this condition, distant objects appear blurred because the image is formed in front of the retina instead of on it. This occurs due to either an elongated eyeball or excessive curvature of the cornea/lens. Myopia is corrected using concave (diverging) lenses. Far-sightedness or hypermetropia is the opposite condition where nearby objects appear blurred. Cataract is the clouding of the eye's lens with age. Presbyopia is the age-related loss of the eye's ability to focus on nearby objects due to reduced flexibility of the lens.
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