Date of Award
Master of Science in Vision Science
The advent of computer aided videokeratology has many practitioners hopeful that the fitting of rigid gas permeable contact lenses will become more efficient and successful than diagnostic and empirical methods; therefore making an RGP lens more often the lens of choice. This is especially important in a day when the growth of managed health care necessitates less doctor time per patient. The EyeSys Corneal Analysis System and the MasterVue System both claim to provide these benefits using somewhat different fitting strategies. This study assesses the success of each method of lens fitting according to patient satisfaction and on-eye lens performance.
Twenty-nine subjects were initially fitted with one lens generated by the MasterVue System and one lens generated by the EyeSys Corneal Topography System. The authors graded the lens position, edge pattern, apical pattern, visual acuity, over-refraction and overall outcome. Subjects were asked to grade vision, lens comfort and preferred eye. The only areas where one system's lens statistically performed better was subjective comfort and preferred eye. In both cases the MasterVue did better than the EyeSys. The authors feel the difference in comfort was due to the fact that the MasterVue usually designed a larger lens than the EyeSys. However, neither system performed well overall. Only 12.5% of the patients who were followed at the dispense were allowed to keep and wear their lenses.
While there are some cases where a detailed topographical map of the cornea is very helpful in fitting certain patients, particularly those with irregular corneas, the study indicates both systems in their current form are not accurate enough to be used in the fitting of the average low myope to make their use cost effective.
Carr, Christina Marie and Ihnatko, Todd Hamilton, "Comparison of RGP fitting capabilities: MasterVue vs. EyeSys" (1995). College of Optometry. 1116.