12 Contact lens back side measurement
40 / 106 Instruction Manual Keratograph 5M (G/77000/XXXX/EN – Rev05)
12 Contact lens back side measurement
Measuring of the back surface of contact lenses works similarly to mea-
suring corneas.
After the contact lens has been secured into place in the contact lens
holder, the latter can be put onto the fixation clip (see below).
12.1 Parts for Measuring the Back Surfaces of Contact Lenses
12.2 Fill the Contact Lens Holder with Water
Unscrew the union nut to open the contact lens holder.
Pour in the water and close the contact lens holder again by screw-
ing the lock nut back on. Make sure that as little air as possible gets
trapped inside.
Hold the contact lens holder so that the adjusting screw points
downwards.
Screw the adjusting screw further into the contact lens holder until
the top part of the contact lens holder is fully wet with water.
Then screw out the adjusting screw again until the surface of the
water takes on a slightly concave curvature.
Fig. 12-1: Mounting Parts for Measuring the Back Surfaces of Contact Lenses
1
2
3
6
5
4
1 Reference sphere holder
2 Contact lens holder
3 Mounting clip
4 Contact lens holder, enlarged view
(top part)
5 Contact lens holder, enlarged view
(lock nut)
6 Contact lens holder, enlarged view
(adjusting screw)
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