By Edward S. Bennett OD MSEd, Milton M. Hom OD FAAO
Curiosity in prescribing inflexible gasoline permeable (RGP) touch lenses is at the upward thrust, fueled through the elevated use of orthkeratology, bifocal lenses, and advances in corneal topography (making becoming easier). This concise and finished source presents important assurance 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 significant other CD-ROM to demonstrate the best techniques.
- Content focuses in particular on inflexible gasoline permeable touch lenses so all of the crucial info wanted for prescribing and becoming is in a single, handy resource.
- A better half CD-ROM illustrates the tricky becoming thoughts encountered with RGPs.
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Extra info for Manual of Gas Permeable Contact Lenses
4 Patient Selection, Evaluation, and Consultation EDWARD S. BENNETT O ne of the common misperceptions about gas permeable (GP) lenses is that they are complicated: they require too much time to design and fit. This is not true, particularly with recent improvements in manufacturing and design technology. GP lens application should not differ significantly from soft lenses in the amount of time used by the practitioner for design and fitting and follow-up evaluation. It can be argued, via the relative benefits in eye health and safety, that follow-up care is less for patients with GP lenses than for those with soft lenses.
9. Benjamin WJ: “Wiggle room” and the transitional Dk statistic, Int Contact Lens Clin 25:118-120, 1998. 10. Hill RM: The “physiologically effective” correlates: peDk/L and peDk, Optom Vis Sci 76(3):135-140, 1999. 11. Lebow KA, Campbell-Burns D: Understanding the values that describe oxygen flux through a contact lens, Contact Lens Spectrum 13(1):34-39, 1998. 12. Benjamin WJ: A transitional period for Dk values, Contact Lens Spectrum 13(10):16, 1998. Chapter 2 Material Properties 47 13. Morgan CF, Brennan NA, Alvord L: Comparison of the coulometric and polarographic measurement of a high-Dk hydrogel, Optom Vis Sci 78:19-29, 2001.
This terminology will appear on all literature nationwide and in all RGP Lens Institute resources and programs. LENS MATERIALS TODAY The lens material most commonly used today is fluoro-silicone/acrylate (F-S/A). Less commonly used today is silicone/acrylate (S/A), with styrene-based materials used occasionally. Silicone/Acrylate The introduction of these copolymers in 1979 was a major breakthrough in gas permeable material lens clinical application. These 48 Chapter 3 Gas Permeable Materials 49 lenses were much more stable than the first GP material to obtain Food and Drug Administration (FDA) approval, which was manufactured from cellulose acetate butyrate (CAB).