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Presbyopia is the eye's diminished power of accommodation that occurs with aging. The most widely held theory is that it arises from the loss of elasticity of the crystalline lens, although changes in the lens' curvature from continual growth and loss of power of the ciliary muscles (the muscles that bend and straighten the lens)...

Myopia is a refractive defect of the eye in which light focuses in front of the retina. Those with myopia are often described as nearsighted or short-sighted in that they typically can see nearby objects clearly but distant objects appear blurred. The opposite of myopia is hyperopia or "farsightedness". Myopia is the most common eyesight problem...

Approximately 14 million Americans have diabetes mellitus; but many of them don't know that they are affected. In addition to causing numerous systemic complications (such as kidney failure, hypertension, and cardiovascular disease), diabetes is one of the leading causes of blindness among working-age Americans. Diabetes is a disease that affects not only the blood sugar levels,...

Floaters, or muscae volitantes (Latin: "flying flies"), are entoptic phenomena characterized by shadow-like shapes which appear singly or together with several others in one's field of vision. They can take the form of spots, threads, or fragments of cobwebs, that float slowly before one's eyes. [accordions] [accordion title="Description" visible="yes"] Floaters are suspended in the thick fluid of...