TY - JOUR
T1 - Photorefractive keratectomy for severe postkeratoplasty astigmatism
AU - Campos, M.
AU - Hertzog, L.
AU - Garbus, J.
AU - Lee, M.
AU - McDonnell, P. J.
N1 - Funding Information:
Accepted for publication June 26, 1992. From the Doheny Eye Institute, and Department of Ophthalmology, University of Southern California School of Medicine, Los Angeles, California. This study was supported by a grant from the Autry Foundation, Los Angeles, California (Dr. McDonnell). Reprint requests to Peter J. McDonnell, M.D., Doheny Eye Institute, 1450 San Pablo St., Los Angeles, CA 90033.
PY - 1992
Y1 - 1992
N2 - We performed cylindric corneal ablations with the excimer laser on 12 patients to correct severe, disabling astigmatism after keratoplasty. In some patients, an additional ablation was performed to correct myopia. Patients were followed up for an average of eight months (range, six to 14 months). Uncorrected visual acuity improved in nine patients, and nine of the 12 patients had a decrease in refractive cylinder at last follow-up. The mean preoperative refractive cylinder was 7.0 ± 3.6 diopters, which decreased to a mean of 3.1 ± 2.6 diopters at one month (P = .0003) and 4.3 ± 2.9 diopters at last follow-up (P = .03). Keratometric astigmatism decreased from 7.5 ± 3.9 diopters preoperatively to 5.2 ± 3.9 diopters at the last follow- up (P = .001). Mean spherical equivalent was reduced from -7.4 ± 4.2 diopters preoperatively to -3.3 ± 4.4 diopters postoperatively (P = .003). Postoperative corneal haze, when present, did not reduce visual acuity. Excimer laser superficial keratectomy thus appears to be safe when used for postkeratoplasty ametropia, although substantial regression may limit its effectiveness in some patients.
AB - We performed cylindric corneal ablations with the excimer laser on 12 patients to correct severe, disabling astigmatism after keratoplasty. In some patients, an additional ablation was performed to correct myopia. Patients were followed up for an average of eight months (range, six to 14 months). Uncorrected visual acuity improved in nine patients, and nine of the 12 patients had a decrease in refractive cylinder at last follow-up. The mean preoperative refractive cylinder was 7.0 ± 3.6 diopters, which decreased to a mean of 3.1 ± 2.6 diopters at one month (P = .0003) and 4.3 ± 2.9 diopters at last follow-up (P = .03). Keratometric astigmatism decreased from 7.5 ± 3.9 diopters preoperatively to 5.2 ± 3.9 diopters at the last follow- up (P = .001). Mean spherical equivalent was reduced from -7.4 ± 4.2 diopters preoperatively to -3.3 ± 4.4 diopters postoperatively (P = .003). Postoperative corneal haze, when present, did not reduce visual acuity. Excimer laser superficial keratectomy thus appears to be safe when used for postkeratoplasty ametropia, although substantial regression may limit its effectiveness in some patients.
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U2 - 10.1016/S0002-9394(14)71854-9
DO - 10.1016/S0002-9394(14)71854-9
M3 - Article
C2 - 1415453
AN - SCOPUS:0026640606
SN - 0002-9394
VL - 114
SP - 429
EP - 436
JO - American journal of ophthalmology
JF - American journal of ophthalmology
IS - 4
ER -