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3.2.2 Measuring refractive power and corneal curvature radius (Ref-
Keratometer measurement)
When using the data taken by this instrument to select
intraocular lenses, thoroughly determine the selection by also
examining cataract surgery methods and other inspections. If
incorrect measurement data is used to select intraocular lenses,
further surgery might be required.
When using the data taken by this instrument for refractive
correction surgery, thoroughly determine the selection by also
examining surgery methods and other inspections. Refractive
correction surgery conducted according to incorrect
measurements or analysis results may result in further surgery
or severe complication such as keratoectasia.
Note that if diopter is used as the measurement unit for the radius
of corneal curvature, the measured value may differ depending
on the cornea equivalent refractive index. If an incorrect value is
used to select intraocular lenses, further surgery might be
required.
The corneal irregular astigmatism display function is a simple
measurement using keratometer measurement. This function
does not detect all cases of corneal irregular astigmatism.
Measurement itself or correct measurement may not be
performed for some corneal shapes, such as if there is a partial
problem on the corneal shape. Because the corneal irregular
astigmatism display function requires more information than
keratometer measurement, corneal irregular astigmatism may not
be measured even though keratometer measurement can be
performed.
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