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00197_Field_197.txt
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1997-10-29
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714b
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CLC OPHTHALMOMETER MEASURING TECHNIQUE
The ophthalmometer measures the
curvature of the cornea by reflecting
mires (images) from the cornea and taking
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.