The document discusses rigid gas permeable contact lenses, including their benefits, applications, fitting process, and lens design considerations. Some key points covered include: 1. RGP lenses can automatically correct astigmatism, provide good vision and eye health benefits like increased oxygen transmission. 2. The fitting process involves evaluating the lens-cornea relationship using fluorescein dye to identify any bearing, clearance or sealing issues. 3. Important lens design factors are the overall diameter, optical zone size, base curve, thickness, and peripheral curve to achieve a proper alignment fit.

1. In the name of God RGP Lens Design, Fitting and Evaluation By : hossein alimirzaie optometrist

17. Figure 1 : An apical bearing fitting relationship

18. Figure 2 : An apical clearance, low edge clearance fitting relationship

19. Figure 3 : A high edge clearance fitting relationship

21. Fluorescein evaluation of the lens-to-cornea fitting relationship should be performed at both the fitting and all progress evaluation visits.

27. a. Palpebral Aperture Size(PAL) . Normal PAL values range between 9mm-10.5mm. In most lid-to-cornea relationships there is, at minimum, slight overlap of the lids over the limbus.

28. Figure 4 : A lid attachment fitting relationship

35. When making lens design changes, it is important that this change is significant enough to result in an improvement in the lens-to-cornea fitting relationship

38. به امید موفقیت وسربلندی شما