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ALK technology in refractive error surgery

V. Usov, G. Droshina
Filatov Institute of Eye Diseases and Tissue Therapy, Odessa, Ukraine


Purpose: We studied results of automated lamellar keratoplasty (ALK) as a refractive surgical procedure currently used to correct myopia and hyperopia.
Methods: The ALK procedure was performed on 49 eyes of 27 patients with myopia between -4.0D and -2.7D (mean preoperative spherical equivalent - 7.63D) and 8 eyes (5 patients) with hyperopia between +2.5D and +7.0D (mean preoperative spherical equivalent +4.2D).All had stable refraction for at least one year and could not be comfortably corrected with glasses or contact lenses. Hinge corneal cap techniques of ALK keratomileusis were used with Chiron automated corneal shaper.
Results: In all cases the section of corneal flap were done correctly and after a surgery all corneas closed up transparently. After the operation mean myopia refraction redused to -1.43D and hyperopia to +1.34D. Refractive power of cornea myopic patients reduced on average in 4.73D and increase to 2.35D in hyperopic group without charges preoperative level clinical astigmatism. Visual acuity attained the high level (on average -0.81 in myopic and 0.68 in hyperopic group) and was equal to the visual acuity with best correction before surgery.
Conclusions: This work indicates that ALK is the simple and effective method of surgical correction of myopic and hyperopic refractive error.

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