Changes induced by orthokeratology do not induce changes in aberrations

Although orthokeratology alters corneal topography, the changes do not cause a shift in aberrations that may diminish visual performance, according to a recent study.

Researchers at Queensland University of Technology in Brisbane, Australia, investigated visual performance in six subjects fitted with orthokeratology lenses. In particular, they evaluated "any residual visual deficits over the duration of a day due to the abnormal corneal topography induced by orthokeratology treatment," the authors said.

Each subject was fitted with a custom design orthokeratology lens in one eye. The fellow eye served as a control.

Investigators found no statistically significant change in best corrected visual acuity when subjects were evaluated under different contrast and luminance conditions, according to the study.

"As expected, orthokeratology lens wear significantly changed unaided vision and refraction from baseline," the authors wrote. "However, it did not significantly affect visual acuity in different contrast conditions or contrast sensitivity."

The study is published in the March issue of Contact Lens and Anterior Eye.