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  • Title: Overnight orthokeratology: refractive and corneal recovery after discontinuation of reverse-geometry lenses.
    Author: Soni PS, Nguyen TT, Bonanno JA.
    Journal: Eye Contact Lens; 2004 Oct; 30(4):254-62; discussion 263-4. PubMed ID: 15499266.
    Abstract:
    PURPOSE: To determine the refractive and corneal topographic recovery after the use of reverse-geometry contact lenses for overnight orthokeratology. METHODS: Both eyes of 15 subjects were fitted with reverse-geometry contact lenses that were worn by the subjects for 1 month. Uncorrected visual acuity, refractive correction (sphere and spherical equivalent), corneal curvature, and corneal thickness were measured during this time and for 2 weeks after discontinuation of lens wear. RESULTS: Ten subjects completed the investigation. Uncorrected visual acuity, refractive correction, and corneal curvature had changed significantly (P = 0.01) after 1 month of lens wear. By the end of 1 month, central corneal thickness was significantly thinner than the baseline value (P = 0.01), but it recovered fully after one night of no lens wear. Recovery of corneal curvature was complete 1 week after lens wear was discontinued. Refractive correction and binocular uncorrected visual acuity recovered fully after 2 weeks. Monocular uncorrected visual acuity remained significantly (P = 0.01) different from baseline acuity 2 weeks after lens discontinuation. CONCLUSIONS: Full effect of overnight orthokeratology in low myopes is achieved within 1 week of initiating use of reverse-geometry lenses. Recovery after short-term use of reverse-geometry lenses is rapid for corneal thickness and corneal curvature. Refractive correction and binocular uncorrected visual acuity recovered fully after 2 weeks. Monocular uncorrected visual acuity was the slowest to recover and had not achieved full recovery after 2 weeks.
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