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sMap3D Corneo-Scleral Topographer Repeatability in Scleral Lens Patients
Gregory DeNaeyer1, Donald R Sanders
1Arena Eye Surgeons (G.D.), Columbus, OH; and Center for Clinical Research(D.R.S.), Elmhurst, IL, Visionary Optics LLC.
Eye & Contact Lens
|July 25, 2017
Summary
The sMap3D Corneo-Scleral Topographer provides repeatable measurements for sagittal height (SAG) and scleral toricity. These findings indicate its suitability for scleral lens fitting procedures.
Area of Science:
- Ophthalmology
- Optometry
- Biomedical Engineering
Background:
- Accurate corneoscleral measurements are crucial for successful scleral lens fitting.
- The sMap3D Corneo-Scleral Topographer is a newer instrument for capturing these measurements.
Purpose of the Study:
- To assess the repeatability of measurements obtained with the sMap3D Corneo-Scleral Topographer.
- To determine if these measurements are reliable for scleral lens fitting.
Main Methods:
- Retrospective study of 25 eyes from 23 patients undergoing scleral lens fitting.
- Two sMap3D examinations per eye on the same day.
- Measurements included sagittal height (SAG), principal toricity magnitude, and steep axis location at a 16-mm chord diameter.
Main Results:
- Mean difference in SAG between repeated measurements was 14 μm (SD 55 μm); 95% of cases within 100 μm.
- Mean difference in toricity magnitude was 0.15 D (SD 0.38 D); all cases <1 D.
- Mean toric axis difference was 2.5° (SD 18.4°); 84% of cases within 15°.
Conclusions:
- sMap3D measurements of scleral toricity and SAG are repeatable at a 16-mm diameter.
- The instrument demonstrates sufficient reliability for use in scleral lens fitting.
