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Keratoconus Glossary S-T

A-B   C-D   E-F   G-H   I-J   K-L   M-N   O-P   Q-R   S-T   U-V   W-X   Y-Z

S

 
 

Sclera - The outer coating of the eyeball that forms the white of the eye; surrounds the optic nerve at the back of the eyeball.

 

Scleral contact lenses – Lenses that vault over the cornea and are supported by the white portion of the eye.

 

Slit lamp - Table-top microscope for examining the eye.

 

Snellen chart - An eye chart used to test a patient's vision.

 

Snellen line - A line of same-sized letters on an eye chart that is used to test a patient's vision.

 

Soft contact lenses - A contact lenses made of gel-like plastic containing varying amounts of water.

 

Soft Perm lenses - A soft lens with a hard center

 

Spot scanning laser - A medical instrument that produces a powerful beam of light that is focused at close range to remove corneal tissue. Spot scanning lasers use radar technology to track the eye's movement.

 

Stroma - Thickest part of the cornea (450-600 microns - approximately .5 millimeters). Between Bowman's membrane and Decemet's membrane.

 

Symmetry of refractive error - The refractive error in both eyes are close to the same value.

 
 
T
 
 

Tear film - A very thin film of water and other chemicals riding on top of the epithelium that lubricates the front of the eye.

 

Topical proparacain hydrochloride - Anaesthetic eye drops.



Toric - A specialist lens design that employs two different optical powers at right angles to each other for the correction of astigmatism.

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