CL101 Chapter Notes - Chapter 10: Bifocals, Solar Energy Generating Systems, Lisa Lopes
Document Summary
Steps in measuring bifocal height using lower lid or limbal method: Fitter positions himself or herself on the same level as the subject, subject fixates the bridge of the fitter"s nose. While correctly holding the frame in a wearing position, the fitter places the pd ruler vertically in front of the subject"s right eye. The zero point is at lower limbus and the ruler scale is positioned downward. For a rimmed frame, the fitter reads the scale at the level of the lowest point where the inside of the groove would be. For a rimless frame, the reference is level of the lowest point on the demo lens. Subjective determination is the most accurate means of determining the seg height and of assuring the wearer that the bifocal will be positioned properly. It is important to ensure that the wearer can see in the appropriate areas when reading through a portion of the lens (brooks and.
