Create a Formula to Extrapolate the Corneal Sagittal Height to Fit Scleral Contact Lenses By Using the Medmont E300 Corneal Topographer Without the Need of the Vistane Ocular Coherence Tomography.

Background: This study predicts a modified equation for calculating sagittal depth for a
desired scleral lens diameter without the need of an anterior segment Vistane Ocular
Coherence Tomography (OCT). This will allow eye care practitioners to fit scleral lenses
more effectively. Scleral lenses are mostly used in a specialty contact lens setting. These include- but are not limited to- vision improvement with irregular corneas, corneal
protection, cosmetics and sports. Methods: Thirty eight subjects, totaling 76 eyes, volunteered to be a part of this study. The data collected through Medmont E300 and Vistane OCT was then statistically analyzed to create an equation to predict a sagittal height for fitting various diameter scleral contact lenses. Results: An excel program was used along with a statistical analysis software (SPSS) program which showed that the (_ collected data followed quadratic relationship. This relationship showed P << 0.05.
Conclusion: The eye care practitioner enters the desired scleral lens diameter and the
Medmont topography sagittal height value at a lO.Omm chord length into the equation to
obtain the sagittal height parameters for a trial lens. It is critical for optometrists,
especially those serving the specialty contact lens field, to be able to provide the most
appropriate contact lens option to the patient.