LENS DYNAMICS, INC.

SCLERAL HISTORY

• Original contact lens• Hand ground glass lenses• Fit by casting a mold of the cornea

EARLY SCLERAL PERFORMANCE

• Difficult to fit• Hard to manufacture and reproduce• Corneal hypoxia• Very short wearing times• Corneal molding – The negative kind

SCLERAL DEFINED

• Mini-Sclerals – 12.5mm to 14.5mm• Medium Range Sclerals – 15.0mm to

18.0mm• Full Sclerals – 18.5mm to 28.0mm

SCLERALS – FIRST OR LAST RESORT?

WHY FIT A SCLERAL LENS?

THE PRO:• To vault highly irregular corneas• To provide better visual acuity than soft

lenses• To prevent lost lenses• New Oxygen permeable materials

WHY FIT A SCLERAL LENS?

THE CON:• Harder to fit• Harder to insert and remove• Can reduce metabolic waste removal• Potential for hypoxia• Harder to fit

THE PRACTICAL:

• First or Last Resort as a design?• Who fits sclerals at all?• Who fits sclerals as the design of First

choice?• Who fits sclerals as a design of Last

resort?

THE DESIGN:

• 13.0mm, 13.5mm, 14.0mm• Lathe cut on DAC ALM lathes• Spherical back and front surfaces• Normally NOT fenestrated

HOW TO FIT

• Start with a base curve close to average Ks

• Trial for best alignment pattern as possible• Be sure there is NO conjunctival drag• Do spherical over-refraction• Need 0.5mm of movement

FITTING TIPS

• Fill concave side with saline/wetting drops into posterior of trial lens

• Dip fluorescein strip into solution• Insert using 2 fingers to handle the trial

lens with patient looking at floor• Low riding lens – select flatter base curve• Flatten base curve to solve edge

tightening

CASE HISTORIES

48 years old, Caucasian male, OD cornea

• Can’t use bi-toric• Quadrant Specific

base curve not indicated

• Temporal/superior area eliminates reverse curve design

• Select Semi-Scleral 13.5 design

CASE 1

48 years old, Caucasian male, OD cornea

• Average K is 47.00 D. or 7.18mm

• Select 7.20mm BC from trial set, 13.5mm -4.00

• Acceptable fit with -2.25 over-refraction

CASE 1

22 years old, African American male, OS cornea

CASE 2

• Superior, peripheral area too steep for Quadrant Specific base curve

• Bi-toric not indicated• Select Semi-Scleral

13.5 design

22 years old, African American male, OS cornea

• Average K is 47.00 D. or 7.18mm

• Select 7.20 BC from trial set, 13.5mm

• Lens too tight at edge and too much vaulting

CASE 2

22 years old, African American male, OS cornea

• Select trial lens 0.2mm flatter or 7.40mm

• Acceptable fit• Perform spherical

over-refraction

CASE 2

31 year old Caucasion female, OD cornea

• Bi-toric not indicated• Flatter areas too

narrow for Quadrant Specific base curves

• Reverse curve design not indicated

• Select Semi-Scleral 13.5 design

CASE 3

31 year old Caucasion female, OD cornea

• Average K is 46.25 D. or 7.30mm

• Select 7.30mm trial lens from trial set

• Low riding lens-select flatter base curve

CASE 3

31 year old Caucasion female, OD cornea

• Select 7.50mm base curve from trial set

• Acceptable fit with lens properly positioned

• Perform spherical over-refraction

CASE 3

Questions?