Page 183 - PowerPoint 演示文稿

Progressive Addition Lenses 173

• Close your RE to avoid parallax error.
• Observe the position of the light reflection in the wearers RE relative to
the vertical PD line already marked on the lens.
• Place a small horizontal mark on the PD line corresponding to the pupil
centre.

Fig. 11.59: Fitting height measurement (29 mm in this picture)

• Ask the wearer to look at your RE and complete the procedure for the
other eye.
• Move the frame up and down slightly, let it settle, and report for both
eyes.
• Confirm the final marked lens insert.
The ideal position of the fitting cross should be as shown in the Figure 11.60:

Fig. 11.60: Ideal position of the fitting cross