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00158_Field_158.txt
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1997-10-28
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KERATOMETER MEASURING TECHNIQUE
The keratometer 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 ). Since the
measurement is made from just these
two small points, the keratometer 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.