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Contact lenses help improve topographic values after cross-linking
Br J Ophthalmol. 2011;95(10):1402-1405
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Rigid gas permeable contact lens wear provided improved topographic parameters after cross-linking to stabilize progressive keratoconus, a study found.
The study compared 15 eyes without contact lenses and 12 eyes that were fitted with contact lenses 1 to 10 weeks after surgery. Outcome measures included the change from baseline in best corrected visual acuity, refractive sphere and cylinder, keratometry and astigmatism values, inferior-superior (I-S) value on EyeSys (EyeSys Vision) and maximal keratometry value on Pentacam (Oculus). Measurements were taken before surgery and at three 6-month intervals after surgery.
In the group that did not receive contact lenses, there were no significant changes to the study parameters throughout the duration of follow-up. However, in the group that received contact lenses after surgery, significant improvements were observed at all follow-up intervals for I-S values and maximal keratometry values, at 6 and 12 months for refractive power steep and simulated astigmatism values, and at 12 months for refractive power flat values.
"We do realize that we have presented a small series of patients in this study," the study authors said. "We have, however, succeeded in giving a more balanced view on the efficacy of the current [cross-linking] technique, documenting the influence of fitting [contact lenses] after [cross-linking] on topographic outcome parameters."