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Previous to LASIK, this was the most popular laser vision improvement procedure. For the PRK procedure, the surgeon initiates by removing the eye’s protective first layer of cells, or epithelium, to reveal the next layer of corneal tissue.

Pertaining to the radius or line from a circle center to the circle itself.

The exam performed throughout an eye test to define the eyeglass lens powers needed for optimum visual acuity.

A backwards shift from the initial visual outcome, following refractive surgery.

A type of table top microscope for eye examinations.

A usual higher-order deviation of lenses or the eye that causes glare and halos around lights at night.

Fine filaments of light approaching off a light source, such as a electric light source in a room.

The cornea’s middle layer; it comprises of lamellae (collagen) and cells, and makes up most of the cornea.

An irritation of one or more of the structures that make up the middle layer of the eye called the uvea.

Sharpness of vision, typically as measured with the use of a Snellen chart. 20/20 is considered usual visual acuity, however some people can see even better, such as 20/15 or 20/10.