Angela Shin, OD, FAAO, presented the findings at the 2011 meeting of the American Academy of Optometry from a series of 116 eyes of 72 patients over a 2-year period. The cohort included 100 eyes with keratoconus and 16 with post-LASIK ectasia. About two-thirds of the eyes were of patients who were CL-intolerant and not actively wearing a CL on presentation.
"With its soft skirt and reverse-geometry landing system, this hybrid lens is designed to provide comfort and good vision in eyes with irregular corneas, and our results show that comfort is an important factor in its success," said Dr. Shin, research fellow, CLEI Center for Keratoconus. "Practitioners should be prepared for an initial learning curve with fitting this hybrid lens. They should not, however, get frustrated because the learning curve is relatively short, and ultimately, results will be good."
Patients in the study ranged in age from 11 to 72 years (mean, 37); men outnumbered women 2:1. The study defined success as continued wear at 3 months after the final fitting, which 63% of eyes achieved after an average of 2.6 diagnostic lens fits. The success rate increased to 72.5% after the investigators excluded the first 25 cases to allow for a learning curve.
Among successful patients, 88% of eyes had stable or improved vision, while patients cited comfort as the main reason for continuing hybrid lens wear in eyes with no change or loss from habitual visual acuity.
Within the successful subgroup, the average eye gained 1.25 lines of vision, one eye lost 2 lines of vision, and none lost more than 2 lines. Among the 40 eyes previously wearing CLs, 26 (65%) were successful, and 10 (38.5%) had improved vision.
"Looking at the distribution of change in visual acuity in eyes that had been habitually corrected with a [CL] showed only a slight skew to lines gained, but it was not an overwhelming pattern. These data further support the idea that comfort is a major factor in determining successful wear with this hybrid lens," Dr. Shin said.
We've noticed that you're using an ad blocker
Our content is brought to you free of charge because of the support of our advertisers. To continue enjoying our content, please turn off your ad blocker.