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126 Ophthalmic Lenses

2. If the frame is without demonstration lens, attach a vertical strip of
transparent adhesive tape to each eye of the frame to enable reference
points to be marked (Fig. 10.26).

Fig. 10.26

3. Replace the frame on the subjects face and direct the subject to look
straight into your eyes. If necessary, adjust the height of your chair so
that your eyes are on exactly the same level as those of the subject
(Fig. 10.27).

Fig. 10.27
4. Direct the subject to look straight into your open left eyes and using a
fine tip marking pen, place dots at the same height as the lower edge of
the subject’s right iris. This point often coincides with the line of the
lower lid. Similarly, without moving his head, place a second mark in
front of the subjects left lower iris margin (Fig. 10.28).