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Orthokeratology improves visual acuity, spurs higher-order aberrations
Invest Ophthalmol Vis Sci. 2008;49(10):4314-4320.
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Overnight orthokeratology significantly reduced myopic refractive error and improved uncorrected visual acuity for up to 1 year.
However, the rigid contact lens-based treatment for myopia increased higher-order aberrations and diminished contrast sensitivity, also for 1 year.
The study included 34 eyes of 17 patients; patient age ranged from 20 years to 37 years. Patients underwent visual and refractive assessment before treatment and 1, 2, 3, 6 and 12 months after treatment. Patients were instructed to wear lenses for at least 7 hours nightly.
Overnight orthokeratology reduced mean manifest refraction from –2.17 D before treatment to –0.2 D at 1 month and improved UCVA from 0.71 D to –0.04 D. Best corrected visual acuity did not change significantly. The procedure increased higher-order aberrations and reduced log contrast sensitivity at all spatial frequencies.
“More refinements of overnight orthokeratology procedure are required to minimize the increases in ocular higher-order aberrations and provide a better quality of vision after the treatment,” the study authors said.