The operator must first adjust the instrument eyepiece for his eye.
1. Position a white background in front of occluder.
2. Turn the eyepiece cap counter clockwise as far as possible.
3. Switch on the instrument lamp and view through the eyepiece; a blurred cross will
be seen.
4. Continue viewing through the eyepiece and slowly turn the eye cap in a clockwise
direction to that position where the cross is in the sharpest focus. Do not turn eye
cap back and forth to focus the cross. This tends to stimulate accommodation and
may result in erroneous readings.
5. When the cross is at its sharpest focus, note the reading on the outer periphery of
the eye cap.
6. Repeat steps 3, 4 and 5 several times, if the results are approximately the same
each time the eyepiece is adjusted for your eye.
The calibrated scale on the outer periphery of the eye cap is for the operator’s
convenience. Once he has assured him self that the eyepiece is adjusted for his eye, he
should note and remember the setting. The next time he uses the instrument he merely
turns the eye cap to this setting. Occasionally, this setting should be verified.
14
ORIENTING THE PATIENT FOR EXAMINATION
Summary of Contents for KMS 6
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