iSight Scleral Contact Lens
ISIGHT™ SCLERAL CONTACT LENS
Corneas come in many shapes and sizes. Some so extreme that even standard gas permeable or custom soft lenses can’t correct every patient’s vision. That’s why scleral contact lenses should be a part of any specialty contact lens practice. The iSight™ Scleral contact lens from GP Specialists is designed for those extreme irregular cornea cases.
ISIGHT™ SCLERAL CONTACT LENS – IRREGULAR CORNEA LENS DESIGN
iSight™ Scleral contact lenses are a uniquely designed scleral lens that utilizes multiple aspheric conical curves to achieve a more natural tangential fitting zone. This unique design means that the iSight™ Scleral contact lens has the ability to vault both the cornea and limbus zone while maintaining a minimal sagittal depth that promotes good tear exchange.
Simplified approach to Fitting iSight™ Scleral Contact Lenses
Patient Selection
Ideal scleral contact lens candidates include the following:
Irregular Corneas
Post Lasik Surgery Complications
Keratoconus
Pellucid Marginal Degeneration
Corneal Ectasia
Dry Eye
Keratoplasty Patients
Free Scleral Contact Lens Evaluation
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iSight™ Scleral Contact Lens – Available Parameters
Base Curves: 5.50 to 9.50
Power Range: -20.00 to +20.00 in .25 steps
Standard Diameter: 16.4
Available Diameter Range: 14.2 to 24.00
iSight™ Scleral Contact Lens – Multifocal Parameters
Add power range: +0.50 to +5.00
Center Distance or Center Near
Standard OZ: 1.0
Available OZ: 0.5 to 7.0
Scleral Contact Lens Diagram
Initial iSight™ Scleral Contact Lens Base Curve Selection
We recommend two methods to establish the initial Base Curve to select.
The first method is to select a B.C. that is 2 diopters steeper than the flat K.
The second method is to take the Median Curve and select a lens that is one diopter steeper than the Median Curve.
Place the lens in a DMV© Scleral Cup while applying gentle suction. Fill the cup of the lens with non-preserved saline and insert the lens as described in the insertion and removal section. Non-preserved artificial tears can also be used in lieu of saline.
The lens should vault over the cornea approx. 150 um to 250 um.
Pay attention to the scleral fit to be sure that there is sufficient clearance as to not cause blanching of the limbal vessels
If bubbles form under the scleral lens, remove and reinsert the scleral lens and ensure that the bowl is completely filled with saline. If bubbles remain– the fit is too steep and a flatter B.C. should be selected
Once you have determined the proper B.C., do an over-refraction to determine the final Rx.