By Edward S. Bennett OD MSEd, Milton M. Hom OD FAAO
Curiosity in prescribing inflexible fuel permeable (RGP) touch lenses is at the upward thrust, fueled by way of the elevated use of orthkeratology, bifocal lenses, and advances in corneal topography (making becoming easier). This concise and entire source presents necessary insurance for the prescribing and becoming of RGP lenses. in accordance with the authors' years of craftsmanship in becoming those lenses, this clinically orientated handbook additionally contains a spouse CD-ROM to demonstrate the appropriate techniques.
- Content focuses in particular on inflexible gasoline permeable touch lenses so all of the crucial details wanted for prescribing and becoming is in a single, handy resource.
- A significant other CD-ROM illustrates the tough becoming thoughts encountered with RGPs.
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Additional resources for Manual of Gas Permeable Contact Lenses
Bennett ES: Material selection. In Bennett ES, Henry VA, editors: Clinical manual of contact lenses, Philadelphia, 1994, JB Lippincott, pp 27-40. 31. Levitt AP: Specific gravity and RGP lens performance, Contact Lens Spectrum 11(10):43, 1996. 32. Giedd B: Understanding the nuances of contact lens materials, Contact Lens Spectrum 14(7):23, 1999. 3 Gas Permeable Materials EDWARD S. BENNETT MATERIAL SELECTION T he selection of the gas permeable (GP) lens material often is considered secondary to the lens design and fitting relationship.
2. Bennett ES: Matching the patient with the gas permeable material, Rev Optom 139(5): 45, 46, 2002. 3. Bennett ES, Tomlinson A, Mirowitz MC, et al: Comparison of overnight swelling and lens performance in RGP extended wear, CLAO J 14:94-100, 1988. 4. Quinn TG: Material solutions for gas permeable questions, Contact Lens Spectrum 15(5):19, 2000. 5. Doane M, Gleason W: Tear film interaction with RGP contact lenses. Presented at the First International Material Science Symposium, March 1988, St. Louis.
Today’s materials possess cross-linkers to enhance rigidity, while providing higher Dk values. However, one study has shown that the advantage of crosslinkers may not translate into measurable clinical benefits. 26 Do the new materials offer better flexure resistance? Although these newer generation materials may still flex on the eye, the problem is considered greatly reduced than during the days of Polycon. 27 However, the answer may not be that simple. Another study has shown that there is no correlation between permeability and flexure measured with autokeratometry.