Accuracy of Corneal Lenticules Produced for Lamellar Refractive Corneal Surgery

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Abstract
The layer thickness of the corneal lenticules separated with the Berlin microkeratome and shaped by keratomileusis, keratophakia, keratokyphosis, and intrastromal excimer-laserkeratomileusis was measured with the Universal Measuring Microscope. The vertices of most corneal lenticules showed an undercorrection of the measured values compared with the calculated ones. In keratomileusis, the vertex of the central part of the optical zone of 3.6 mm attained 79 ± 19 µm instead of 80 µm (99%); in keratophakia, 74 ± 19 µm instead of 80 µm (93%); in myopic keratokyphosis, 77 ± 11 µm instead of 105 µm (74%); in hyperopic keratokyphosis, 72 ± 28 µm instead of 105 µm (69%); and in excimer-laserkeratomileusis, 52 ± 12 µm instead of 39 µm (120%). The undercorrection of myopic and hyperopic keratokyphosis indicate that this type of nonfreeze keratomileusis is not capable to cut a tissue lens of predicted refraction from compressed corneal tissue. Near symmetrical profiles were achieved in all types of refractive corneal surgery but excimer-laserkeratomileusis had the smallest standard deviation. It was significantly smaller than in hyperopic keratokyphosis (p

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