A prospective, nonrandomized cohort study evaluated corneal changes and ocular aberrations during an orthokeratology test. Fourteen myopic patients (26 eyes) underwent an orthokeratology fitting test with the BE contact lens (Ultravision Pty, Ltd, Brisbane, Australia). Best spectacle-corrected visual acuity (BSCVA), uncorrected visual acuity (UCVA), subjective cycloplegic refraction, biomicroscopy, corneal topography, optical pachymetry and aberrometry were performed at baseline and one and eight nights of orthokeratology. The short-term effect of orthokeratology using corneal topography, tomography and ocular aberrations was evaluated.
Myopia reduction resulting from rapid central corneal flattening and improvement of UCVA occurred after orthokeratology. Higher-order aberrations, particularly spherical aberration and coma, increased significantly during the orthokeratology test. An increase of temporal pachymetry and differences in coma direction induced between the eyes may be related to the subclinical lens decentration temporally.
SOURCE: Stillitano IG, Chalita MR, Schor P, et al. Corneal changes and wavefront analysis after orthokeratology fitting test. Am J Ophthalmol 2007; July 23 [Epub ahead of print].