Visual Acuity
The clearness of vision; the ability to distinguish details and shapes.

Accommodation
The ability of the eye to change its focus from distant objects to near objects.

Optician
An expert in the art and science of making and fitting glasses and may also dispense contact lenses.

Keratoconus
A disorder characterized by an irregular corneal surface (cone-shaped) resulting in blurred and distorted images.

Ophthalmologist
A medical doctor specializing in the diagnosis and medical or surgical treatment of visual disorders and eye disease.

Monovision
The purposeful adjustment of one eye for near vision and the other eye fordistance vision.

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

Glare
A catter from bright light that decreases vision.

Undercorrection
A complication of refractive surgery where the achieved amount of correction is less than desired.

Lens
A part of the eye that provides some focusing power. The lens is able to change shape allowing the eye to focus at different distances.