Page 98 - The Book Pi in eye

Rajesh Khanna, MD

expand the equator of the eye. The theory behind SEB is that
expansion of the eye will allow increased room for the lens to move
normally, enabling the eye to see nearby objects again. A number of
studies now suggest that this procedure is ineffective.

Snellen eye chart: The standard eye chart used by eye doctors to
determine visual acuity.

Sphere: One of three measurements taken during an eye examination
to arrive at one's eyeglass prescription. The sphere measures where
the eye focuses light on the retina (normal vision), in front of the
retina (myopia), or behind the retina (hyperopia).

Starburst: A visual aberration in which the patient sees rays radiating
from lights viewed at night. Sometimes experienced by patients who
have undergone RK and Lasik.

Stroma: The strong, fibrous layer that makes up 90 % of the cornea's
thickness and provides the cornea with its structure and shape. Also
called the stromal bed, this is the part of the cornea sculpted with the
laser in Lasik surgery.

Surgical Reversal of Presbyopia (SRP): See scleral expansion
bands.

Tonometry: The measure of intraocular pressure, or the pressure
inside the eye.

Topical Corticosteroid: A medicated eye drop that prevents
inflammation of the eye tissue after surgery.

Undercorrection: A complication of Prelex; results when the amount
of correction resulting from the Prelex procedure is less than
intended. Most undercorrections can be treated with an enhancement
procedure.

Visual acuity: The sharpness or clarity of vision that enables one to
distinguish fine details and shapes.

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