Page 90 - The Book Pi in eye

Rajesh Khanna, MD

Astigmatism: A refractive error caused by an asymmetrically shaped
cornea. Rather than being round in shape like a basketball, an
astigmatic cornea is shaped like a football, causing light to come to
several points of focus instead of meeting at a single point of focus.
People with astigmatism experience blurred images or double vision.

Axis: A measurement of the direction of astigmatism. The astigmatic
cornea is oval in shape, and axis is the angle of the long direction of
the oval against a horizontal line.

Benchmarking: The process of tracking statistical outcomes for the
purpose of predicting future outcomes. With Prelex, statistics from
1,000 or more procedures can provide a good basis for benchmarking.

Best corrected vision: The best possible vision achieved with
corrective eyeglass lenses.

Blended vision: The surgeon sets one eye for distance and the other
eye for intermediate vision. The brain is able to retain binocularity.

Board certified: A credential awarded to physicians who have
undergone the additional training and proved proficiency in an area by
passing a rigorous examination. Ninety percent of ophthalmologists
are board certified. If a surgeon is not board certified in
ophthalmology, BEWARE!

Cataract: Clouding of the natural lens within the eye, causing blurry
vision.

Choroid: Middle layer of the eye containing pigment and blood
vessels that provide oxygen and nutrients for the retina

Constrict: To become smaller.

Cornea: The outer, dome-shaped, transparent part of the eye that
bulges out at the front of the eyeball and covers the iris and pupil. Its
curvature causes light to bend. The cornea provides most of the eye's
focusing power. It is the only part of the eye on which LASIK is
performed.

84