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Are eyes spheres?

Is the Earth a sphere? More or less. It depends how accurately and detailed you want to measure them. The globe (eyeball) is shaped more like a pear: It has a "bulge" on the front where the cornea, iris, and natural lens are. The curvature of the corneal surface is...

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Will everyone have presbyopia and cataracts?

This is actually the same question as "Why do we have to physically age?" Presbyopia and "cataract" are the inevitable effects of aging in the natural lens of the eye. The gradual loss of function is similar to what age does to our skin, hair, bones, and joints....

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What is PreLex?

PreLex (Presbyopic Lens Exchange) is "The removal and replacement of the natural lens of the eye with any degree of cataract where the goal is to provide uncorrected (no glasses) Distance, Intermediate, and Near (reading) vision." PreLex is best suited to people over...

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Who invented LASIK surgery?

No single person invented LASIK. Rather, it was the child of a marriage of two different, early myopia (nearsightedness) correcting procedures: 1) Keratomileusis and 2) PRK (PhotoRefractive Keratoplasty). Pioneered by Columbian ophthalmologist, José Barraquer, in...

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What causes keratoconus?

Keratoconus is a hereditary condition of the cornea typically characterized by its being very thin, lacking radial symmetry, and/or shape instability. Any of these in combination can cause irregular vision that is not well-corrected with glasses or soft contact lenses....

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Does LASIK have long term side effects after a few years?

I imagine you mean can there be problems with one's vision or eyes from having LASIK that do not show up until years later. For the most part, if there was good patient selection and an initial good visual result, the answer is "No." Most people with good distance vision...

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Can a young person (20s) have IOL surgery if they are not a good candidate for laser eye surgery?

If by "IOL surgery" you mean the removal and replacement of your natural lens with a cataract-type intraocular lens, the answer is a VERY tentative "Yes." There are many reasons NOT to do this at your age. The quality of vision under different lighting conditions is NOT...

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What happens when you have your eyes dilated?

Dilating drops make your pupil bigger by working on the iris muscles. There are two types of chemicals that accomplish this (they are often used together). One type directly stimulates the iris muscles that open up the pupil. This is a very similar chemical to the one in...

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