Glare
A catter from bright light that decreases vision.

Pupil
A hole in the center of the iris that changes size in response to changes in lighting. It gets larger in dim lighting conditions and gets smaller in brighter lighting conditions.

LASIK
The acronym for laser assisted in situ keratomileusis which refers to creating a flap in the cornea with a microkeratome and using a laser to reshape the underlying cornea.

Optometrist
A primary eye care provider who diagnoses, manages, and treats disorders of the visual system and eye diseases.

Radial Keratotomy
The proceedure commonly referred to as RK

Ablation zone
The area of tissue that is removed during laser surgery.

Stroma
The middle, thickest layer of tissue in the cornea.

Microkeratome
A surgical device that is affixed to the eye by use of a vacuum ring. When secured, a very sharp blade cuts a layer of the cornea at a predetermined depth.

Sclera
The tough, white, outer layer (coat) of the eyeball that, along with the cornea, protects the eyeball.

Refraction
A test to determine the refractive power of the eye; also, the bending of light as it passes from one medium into another.