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00197_Field_197.txt
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1997-10-28
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CLC OPHTHALMOMETER MEASURING TECHNIQUE
The CLC ophthalmometer measures the
curvature of the cornea by reflecting mires
(images) from the cornea and takes
readings from two points on the corneal
surface using a doubling technique
(see How the Keratometer Works
-the ophthalmometer works by the same
optical method ). Since the measurement
is made from just these two small points,
the ophthalmometer only gives an
approximation of the central curvature and
does not give information about the whole
surface.
The separation of the two points
on the cornea will vary with the
corneal curvature. For the
average corneal curvature the
separation is about 3.2 mm.