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Diplopia is the medical term for "double vision." Most diplopia is caused by a failure of the muscles controlling the eyes to work in harmony, thus causing the eyes to look in somewhat different directions. It can be intermittent or constant, or can be seen only in...

Any of several transparent synthetic materials that have been tried out over several decades of continued improvement. The very first intraocular lens implants (IOLs) were made of a rigid plastic called PMMA (polymethyl methacrylate), the same material used in fighter...

Yes, it does. And it may well not be for the better -although that is not usually the case fortunately. LASIK is the microsurgical thinning and reshaping of the cornea to improve its focusing power on the retina. The more nearsightedness being corrected, the more the...

Refractive eye surgery is any of several microsurgical approaches to alter the anatomy and physiology of the human eye to provide better focusing power with less or no further dependence upon artificial optical devices such as glasses and contact lenses. Probably the...

All animals have evolved visual systems that maximize their likelihood to pass on their genes to succeeding generations. For animals that are often prey (e.g. frogs and many fish), having the very widest field of vision is highly important to minimize the risk of getting...

Because there is an incompletely transparent object between your eye and the world. While spectacle lenses are invaluable in correcting what eye doctors call Refractive Errors" such as myopia and astigmatism, they do so at a small cost in terms of visual quality. The...

The word "cataract" is the historical term to refer to what was once the leading cause of blindness in the world: an opacified natural lens of the human eye, seen as a white pupil. The white lens was mistakenly thought to be due to some sort of turbulence in the fluid of...

While prolonged computer use can cause eye strain in adults, there is no evidence that it will change or worsen nearsightedness (myopia). In our 40s and older, it may appear we need progressively stronger reading glasses, but this is going to happen anyway and is not an...