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OPERATING PROCEDURE: Other Measurements
3.7.6
Contact lens measurement
To measure the curvature of hard contact lenses, use the provided contact lens holder.
1
Fill the concave top of the contact lens holder with
water.
Use a commercial pipette to fill the concave top of the CL
holder completely with water.
2
Place a contact lens on the contact lens holder with
the surface to be measured facing upward.
When measuring the concave surface, place the lens with
the concave surface up. Conversely, when measuring the
convex surface, place the lens with the convex surface up.
3
Put the contact lens holder on a flat table or
the spherical model eye measuring holder of
the station as shown to the right
.
4
Select KM measurement mode and mea-
sure the contact lens in the same manner as
KM measurement.
Contact lens holder
• Prevent any bubbles from forming. In addition, avoid
water or dust to the measurement surface.
Contact lens
Contact lens
holder
• When the convex surface of a contact lens is measured, the axis angle can be read directly. When
the concave surface is measured, however, the measured axis is reflected over the Y axis.
• Soft contact lenses cannot be measured.
