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00043_Field_43.txt
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1997-10-29
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636b
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21 lines
PROCESSED IMAGE
The image with overlying rings will
be seen on the left side of the screen
with the corneal curvature for each
ring, simulated KΓÇÖs, surface regularity
index (SRI), surface asymmetry index
(SAI), and potential visual acuity (PVA).
SAI usually has a value of less than 0.5
for normal corneas. If the cornea is
distorted the SAI increases and may
be greater than 5 for moderate
keratoconus for example.
PVA is the estimate of what the visual
acuity should be based on the distortion
of the cornea.
The SRI is correlated to the potential visual acuity.