Dr William Boothe

Refractive Power: the ability of an object, such as the eye, to bend light as light passes through it.

Halos are rings around lights due to optical imperfections in or in front of the eye.( - Dr Boothe)



Dr William Boothe: Refraction: a test to determine the refractive power of the eye; also, the bending of light as it passes from one medium into another.



Glare: scatter from bright light that decreases vision.

Dr Boothe

Sclera: the tough, white, outer layer (coat) of the eyeball that, along with the cornea, protects the eyeball. ( Dr William Boothe )



FDA: the abbreviation for the Food and Drug Administration. It is the United States governmental agency responsible for the evaluation and approval of medical devices.

Dr Boothe

Accommodation: the ability of the eye to change its focus from distant objects to near objects.( Dr William Boothe )

Dr William Boothe: Overcorrection: a complication of refractive surgery where the achieved amount of correction is more than desired.

Dr Boothe: Snellen Visual Acuity Chart: one of many charts used to measure vision.