Clinical evaluation of a topographically based contact lens fitting software

Area of Science:

• Ophthalmology
• Optometry
• Biomedical Engineering

Background:

• Second-generation corneal topography software utilizes topographical data for contact lens fitting, moving beyond simulated keratometry and nomograms.
• The EyeSys System 2000 Pro-Fit software (Version 3.1) was assessed for its efficiency in fitting rigid gas permeable (RGP) lenses in normal subjects.

Purpose of the Study:

• To clinically evaluate the efficiency of the EyeSys System 2000 Pro-Fit software in fitting rigid gas permeable (RGP) contact lenses.
• To compare the chair time and success rate of fitting RGPs using topography-based software versus traditional manual fitting methods.

Main Methods:

• Subjects underwent comprehensive eye examinations including manifest refraction, slitlamp evaluation, keratometry, and computerized topographic analysis.
• Contact lens fitting was performed using both the Pro-Fit software and manual diagnostic trial lenses.
• Lens parameters were optimized based on fluorescein patterns and clinical performance, with reordering criteria established for modifications.

Main Results:

• Both manual and topography-guided fitting achieved a successful fit in 77% of eyes (17/22) without further modifications.
• The topography-guided fitting group averaged 8.0 minutes, while the manual fitting group averaged 16.5 minutes, indicating a significant reduction in chair time.

Conclusions:

• The study demonstrates a 51.4% reduction in chair time using the topography-based Pro-Fit software.
• The software achieved comparable clinical results to traditional RGP fitting, highlighting increased efficiency for fitting RGPs in normal eyes.