Hamberg-Nyström H, Fagerholm P, Tengroth B, Sjöholm C
S:t Erik's Eye Hospital, Karolinska Institutet, Stockholm, Sweden.
Ophthalmic Surg Lasers. 1996 May;27(5 Suppl):S418-20.
The aim of the study was to evaluate the refractive outcome 36 months following excimer laser photorefractive keratectomy (PRK) performed on myopic eyes. We analyzed the refractive stability between 24 and 36 months.
PRK was performed on 457 eyes with a pre-operative refraction ranging from -1.25 to -7.50 diopters (D). Ablation zone diameters of 4.3 to 4.5 mm were used. The follow up time was 36 months.
The mean refraction 36 months following surgery was -0.22 to 0.75 D for the whole group, which was not significantly different from the mean at 24 months (-0.27 +0.74D). If we analyze the subgroups at 36 months, we find a significantly better refractive outcome in the low myopia group (up to -2.90D) compared with those with higher myopia. At 36 months, 91% of the 456 eyes had an uncorrected visual acuity of at least 20/40, and 88% of the eyes were within 1.00 D of emmetropia.
These results show stability between 24 and 36 months.
本研究旨在评估准分子激光屈光性角膜切削术（PRK）治疗近视术后36个月的屈光效果。我们分析了术后24至36个月期间的屈光稳定性。
对457只术前屈光度在-1.25至-7.50屈光度（D）之间的眼睛进行PRK手术。采用4.3至4.5毫米的切削区直径。随访时间为36个月。
整个研究组术后36个月时的平均屈光度为-0.22至0.75 D，与24个月时的平均值（-0.27 +0.74D）无显著差异。如果分析36个月时的亚组情况，我们发现低近视组（屈光度最高达-2.90D）的屈光效果明显优于高度近视组。在术后36个月时，456只眼中有91%的裸眼视力至少达到20/40，且88%的眼睛屈光不正度数在1.00 D以内。
这些结果表明术后24至36个月屈光效果稳定。
