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Louise Sclafani, David Slater, Bruno Lay, Christine W Sindt; Topographic Elevation Data to Design Scleral Lenses. Invest. Ophthalmol. Vis. Sci. 2017;58(8):3550.
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© ARVO (1962-2015); The Authors (2016-present)
Ocular Impression technology has been used to effectively create elevation specific scleral lens designs. We propose the elevation data from scanning tomography (Pentacam, Oculus DE) can be used to create an elevation specific scleral lens, without the need for time-intensive contact lens fitting or ocular impressions
Scheimpflug technology was used to collect 5 scans: 1 central, 2 horizontal and 2 vertical exams in primary gaze. Each Sub-exam uses 50 segmental images, so in total 250 Images are captured during the acquisition phase. The 5 examinations are stitched together to create one 3D shape file covering 17mm of the cornea and sclera. There is no fixation displacement during image capture, so tilt reconstruction is not necessary.The software was first validated against known reference test surfaces, and then compared to ocular impression technology 3-D scans. Finally, lenses were generated, using the elevation specific technology in the EyePrint Design software, and evaluated for ocular fit, vision and comfort.
The 3-D shape file matches the reference test surface and is comparable to the ocular impression technology 3-D scans. Scleral lenses generated from tomographic data ranged from 15 to 16.9 mm and showed clinically acceptable alignment 360 degrees. Vision was consistent with best contact lens corrected visual acuity in all cases. Patients reported good comfort.
Scleral contact lenses can be designed using ocular tomography with clinically acceptable alignment.
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
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