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all-day wear amount aphakia aphakic astigmatism back toric lenses base curve Boyd central posterior curve Chapter clinical Contact Lens Medical contact lens patients contact lens practice convex corneal contact lenses corneal curvature corneal cylinder corneal edema corneal lenses corneal surface corneal toricity correction diameter diopter discussion dry spots effect epithelium evaluation Feldman fenestrations finishing fitter fluorescein flush-fitting shell Gould Halberg Hoefle Houston hyperopia hyperopic hypoxia keratitis keratoconus keratometric lens design Lens Medical Bulletin Lens Medical Seminar lens movement lens wear Lensometer ment millimeter minus lenses mires myopia ophthalmologist optical oxygen percent peripheral curve polishing prism prismatic problem procedure radius of curvature refractive refractive index require residual astigmatism result routine Sampson Schlossman scleral lenses scleral shells sclerotic scatter Silvo situation slit lamp spectacle blur staining steeper tact lenses tarsorrhaphy tear exchange technique Thank you Dr thickness tion tolerance tool Topogometer vision visual wear the lenses Welsh Whitham