Rigid gas-permeable contact lens fitting in LASIK patients for the correction of multifocal corneas

Laser in situ keratomileusis (LASIK) has recently become the most commonly performed refractive surgery procedure. Results are promising in correcting low to moderate myopia. Most complications occur during the surgeon's learning curve. One of the complications is a decentration of the ablated...

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Bibliographic Details
Published in:Graefe's archive for clinical and experimental ophthalmology 2001-06, Vol.239 (5), p.361-366
Main Authors: EGGINK, Fred A. G. J, HOUDIJN BEEKHUIS, W, NUIJTS, Rudy M. M. A
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Contact Lenses
Corneal Diseases - diagnosis
Corneal Diseases - etiology
Corneal Diseases - therapy
Corneal Topography
Female
Humans
Keratomileusis, Laser In Situ - adverse effects
Male
Medical sciences
Middle Aged
Ophthalmology
Prosthesis Design
Prosthesis Fitting
Vision disorders
Vision Disorders - diagnosis
Vision Disorders - etiology
Vision Disorders - therapy
Visual Acuity
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Summary:Laser in situ keratomileusis (LASIK) has recently become the most commonly performed refractive surgery procedure. Results are promising in correcting low to moderate myopia. Most complications occur during the surgeon's learning curve. One of the complications is a decentration of the ablated area that causes monocular diplopia and a nocturnal halo phenomenon due to a multifocality of the corneal surface overlying the entrance pupil. The corneal shape is significantly altered after LASIK. We evaluate the efficacy of rigid gas-permeable contact lens designs and fitting techniques used in eight eyes with multifocal LASIK ablations to correct haloes and impaired night vision complaints. We used large-diameter tetra-curved rigid gas-permeable (RGP) contact lenses for visual recovery in eight eyes of seven LASIK patients. We used the power on the transition zone of the corneal topographic map, 0.2 mm outside the ablated refractive area, for selection of the back optic zone radius of the RGP contact lenses. Procedures for lens fitting are described. Visual acuity (high-contrast logarithm of the minimum angle of resolution, LogMAR) was measured before- and 6 months after contact lens fitting. Large-diameter tetra-curve RGP lenses with a mean diameter of 11.85 (SD 0.16) mm were successfully used in LASIK patients with multifocal corneas. Mean best spectacle-corrected visual acuity was +0.3 LogMAR (SD 0.19; in Snellen equivalent, 20/40) and improved significantly with the contact lenses to +0.08 LogMAR (SD 0.11; in Snellen equivalent, 20/25, P=
ISSN:0721-832X
1435-702X
DOI:10.1007/s004170100282