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題名 | Analysis of Corneal Topography after Excimer Laser Photorefractive Keratectomy=準分子雷射屈光性角膜切除術後之角膜地形圖分析 |
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作者 | 胡芳蓉; 譚超毅; 張淑雯; 張懷文; | 書刊名 | 臺灣醫學會雜誌 |
卷期 | 97:3 1998.03[民87.03] |
頁次 | 頁159-164 |
分類號 | 416.76 |
關鍵詞 | 準分子雷射屈光性角膜切除術; 角膜地形圖分析; Photorefractive keratectomy; Corneal topography; Centration; Myopia; Visual acuity; |
語文 | 英文(English) |
英文摘要 | Excimer laser photorefractive keratectomy (PRK) is an effective treatment for myopia. We investigated the magnitude of optical zone decentration and qualitative patterns of. corneal topography after this treatment. We performed computer-assisted videokeratography on 44 myopic eyes (29 patients) that had undergone PRK before and 1, 6, and 12 months after the procedure. Associations of clinical outcomes with decentration and topographic patterns were assessed. The normalized scale of the topography 1 month postoperatively showed a mean decentration of 0.33±0.23 mm (range 0-0.9). Thirty-four eyes had decentration of less than 0.50 mm; 10 had an ablation zone decentered from 0.5 to 0.9 mm. Analysis of geometric mean visual acuities between eves with less than 0.5 mm decentration and those with 0.5 to 0.9 mm decentration demonstrated minimal differences. No eve was decentered more than 1 mm. Four main ablation patterns were noted on subtraction analysis: homogeneous, semicircular, keyhole, and central island. Over time, the number of eyes with a homogeneous pattern increased. Eyes with a homogeneous ablation pattern had significantly better uncorrected visual acuity than those with other patterns. The mean visual acuity was 20/29.1 in the homogeneous group and 20/38.5 in the pooled irregular group 1 month postoperatively (p < 0.05). There was no significant difference among the four ablation patterns at 6 or 12 months after PRK Topographic patterns were not significantly associated with best-corrected vision. |
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