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A - Z of Eyes & Focusing
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
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.
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 0.5 millimeters). Between Bowman's membrane and Descemet'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 corneal epithelium (surface) that lubricates the front of the eye.
Topical proparacain hydrochloride
Anaesthetic eye drops.
U
UCVA
See uncorrected visual acuity.
Uncorrected visual acuity (UCVA)
A person's vision without corrective lenses measured in terms of Snellen lines on an eye chart. Acronym is UCVA.
Undercorrection
The result achieved when desired change in refractive error is not fully achieved.
