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The allowable use of an approved drug or instrument in a method that has not been specifically sanctioned.

Eye health expert trained to deliver primary eye care assistances, such as basic eye wellbeing and vision inspections, diagnosis of vision problems and eye diseases

Also known as refractive lens exchange. Substitutes the natural lens with an advanced non-natural lens, called an intraocular lens or IOL.

Usually referred to as RK; a surgical procedure designed to correct myopia (nearsightedness) by flattening the cornea using radial cuts.

An accumulation of blood beneath the conjunctiva, the clear membrane covering the white part of the eye.

A very slim film of water and other chemicals riding on topmost of the epithelium that lubricates the front of the eye.

To determine the shape of cornea, a topographical map of the surface of the eye.

A contact lens or an intraocular lens implant that is designed to correct astigmatism.

The best possible vision a person can attain without corrective lenses.

Designed to precisely measure the visual capacity of the cornea, a wavefront device transmits a safe ray of light into the eye.