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  • Title: [Photorefractive excimer laser keratectomy in myopia and astigmatism with a 2-year follow-up after surgery].
    Author: Autrata R, Holousová M, Rehůrek J.
    Journal: Cesk Slov Oftalmol; 1997 Aug; 53(4):252-60. PubMed ID: 9377320.
    Abstract:
    In a group of 1037 operated eyes the effectiveness, predictive value, stability and safety of photorefraction keratectomy by means of an excimer laser was tested in myopia (PRK) and astigmatism (PARK) with a two-year follow-up period after operation. The range of the preoperative refraction defect was -1.75 to -2.10 dpt (SE). The maximal value of the corrected cylinder in astigmatism was -6.0 cyl dpt. In the PRK group 459 operations were evaluated, in the PARK group 578 operations. Both groups are classified according to the spherical equivalent of the refractory defect into three groups. Group A is formed by myopia up to -6.0 dpt, group B myopia -6.25 to -10.0 dpt and group C above -10.25 dpt. Non-corrected visual acuity 6/12 and better was recorded in the 20th month after operation in group A in 93.4-97.6% (PARK-PRK) operated eyes, in group B 88.7-91.5% and in group C 61.2-68.4% of operated eyes. The achieved final refraction (SE) in an interval +(-1.0) dpt from the originally planned one was recorded during the 20th month after operation in group A in 92.8-96.5% (PARK-PRK) operated eyes, in group B 73.5-78.9% and in group C 59.7-63.5% operated eyes. The best corrected visual acuity (NKZO) in the whole group 20 months after operation was unaltered or better by 1 line of projected optotypes as compared with NKZO before operation in group A in 97.6%, in group B in 94.3% and in group C in 89.7% operated eyes. The analysis of results in PRK and PARK in the group with a two-year follow-up period after operation permits to evaluate the method as sufficiently effective and safe for correction of myopia up to -10.0 dpt but less predictive in myopia above -10.0 dpt.
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