Scleral-Contact Lenses

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$OPTICAL MATH MADE EASY!$

NormalEyes 15.5 Look-up Table• Select your startingdiagnostic lens usingthe flat keratometrymeridian value:• Recommended BCRis flatter than Flat Kfor normal corneas• Least criticalparameter• Usually in 0.4 mmsteps• Can be ordered in0.1 mm incrementsBase Curve Radius Too FlatMinimal centralclearance(pre compression)Arccuate bubble at J1Base Curve Radius Too SteepProper Base Curve Radius/RZD/LZACentral bubble captureAdequate centralclearanceInsufficient limbal clearanceAcceptable limbalclearance (precompression)Appropriateedge liftA Word About Chair TimeFINAL FIT SUCCESS• Free to evaluate within seconds of lensapplication• Evaluate immediately upon application• Finesse conjunctival compression: Averageknown to be 120 microns• Apply second or third lenses in short serialsuccessionGet it right the first time by having an adequatediagnostic set and observing a series of lenses ifneeded10
Final Fit Success Criteria/post-Compression• Minimal edge lift of 30 to 50 microns• Clearance at 10.5 mm chord (J-2) of 50 microns• Clearance through optic zone of at least 80 microns• Lens movement on push up• Dual axis to control flexure; if flexure observedincrease thickness• No impingement of conjunctival vessels• No bubbles over cornea greater than 1 mmIdeal Fit After ConjunctivalCompressionAn Easy-to-Fit <strong>Scleral</strong> LensA rational 3 Zone Lens with Independent FittingZones• <strong>Scleral</strong> Contour measurement derived rangesand increments• Diagnostic Sets for all cornea types• Get it right the first time• Thinnest scleral lens offered today• Dual Axis controls flexure and providesorientational stabilityNature Hides on the Side of the Flaw• The Wild Card• Conjunctival compression• Conjunctiva thicker closer to the limbus (120 microns)• Thinner 1.5 mm from limbus (70 microns)• Must compensate in RZD for conjunctivalcompressionLearnings from Clinical Trials• Amazing Comfort• Technique still required to remove lenses• Don’t use abrasive cleaners• Can apply lenses with Optifree Express• Don’t need non-preserved saline• Dual Axis nails flexure• Multifocals provide great vision• Chair time reduced with 36 lens Dx set for regular cornea• 24 additional Dx lenses for ectasia (KC, Pellucid and Post Graft)• 12 additional Dx lenses for post surgicalAPPLYING OCULARCONTOUR TO SOFTLENS DESIGN11
Page 1 and 2: THE ROLE OF OCULARCONTOUR IN CONTAC
Page 3 and 4: Contour Based Scleral Lens DesignPr
Page 5 and 6: Fitting Scleral Lenses3. Select a b
Page 7 and 8: Evaluating LZAShallow LZA will imme
Page 9: RZD and LZA Too ShallowRZD Too Deep

Scleral-Contact Lenses

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