Indication of advanced orthokeratology as an additional treatment after refractive surgeries

Iwane Mitsui

doi:10.1117/12.591456

18 April 2005 Indication of advanced orthokeratology as an additional treatment after refractive surgeries

Iwane Mitsui

Proceedings Volume 5688, Ophthalmic Technologies XV; (2005) https://doi.org/10.1117/12.591456
Event: SPIE BiOS, 2005, San Jose, CA, United States

Abstract

Ortho-K was indicated for twenty-three eyes of thirteen patients after refractive surgeries such as RK(1) ,PRK(2), and LASIK(3). The average of their Uncorrective Visual Acuity (UCVA) after surgeries was 20/30 or worse, and mean spherical equivalent (SE) was -2.42D. They were followed at least two years wearing of Advanced Ortho-K lenses during night. The following studies were examined on their auto-refraction, auto-keratometry, uncorrected and corrected visual acuity, intra-ocular pressure, corneal endothelium, corneal thickness, corneal curvature, and corneal shape for more than two years. 95% of the patients improved in UCVA up to 20/20 or better, 86% of them improved up to 20/15 or better, and 76% of them improved up to 20/10. The mean SEs improved to -1.20±1.02D during six months, - 1.03±0.83D during one year, and -0.73±0.64D during two years. Astigmatism also slightly decreased. Ophthalmologic examinations showed no abnormalities including flap formation, intra-ocular pressure, and endothelium. Among the refractive surgeries as well as RK and PRK, LASIK has been most popularly spread all over the world. However, patient's quality of vision is not always satisfied during and/or after refractive surgeries, because of several complications such as instability of flap formation, unexpected keratoectasia, diffuse lamellar keratitis, epithelial ingrowth, irregularity of corneal surface which caused myopia regression. In such cases, additional surgical procedures should not be indicated easily. However, Ortho-K is safe and effective enough to correct refractive errors still remained or re-appeared after refractive surgeries. It enables to restore the corneal irregularity to the ideal shape.

Citation Download Citation

Iwane Mitsui "Indication of advanced orthokeratology as an additional treatment after refractive surgeries", Proc. SPIE 5688, Ophthalmic Technologies XV, (18 April 2005); https://doi.org/10.1117/12.591456

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KEYWORDS

Surgery

LASIK

Monochromatic aberrations

Visualization

Lenses

Selenium

Spherical lenses

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