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題 名 | A Two Years Study of Corneal Topographic Stability Following Radial Keratotomy=放射狀角膜切開術後,角膜曲率穩定性之兩年評估 |
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作 者 | 曾順輝; 呂佳貞; 陳冠甫; | 書刊名 | 中華民國眼科醫學會雜誌 |
卷 期 | 38:1 1999.03[民88.03] |
頁 次 | 頁10-17 |
分類號 | 416.711 |
關鍵詞 | 放射狀角膜切開術; 角膜曲率; Radial keratotomy; Corneal topography; Computer-assisted videokeratography; |
語 文 | 英文(English) |
中文摘要 | 作者採用電腦錄影協助式之角膜弧度曲率圖系統,評估放射狀角膜切開術後角膜 曲率之穩定性。 合計 24 例接受 8 刀離心性切割之患者於術前、術後壹週,壹個月,三個 月, 半年,壹年及兩年分別接受定期性之角膜弧度檢查,作者分別於角膜 4 個主要半子午 線劃出其非球狀曲線及屈光率之改變速率,以及它在不同追�j期之變化,以評估角膜曲率圖 之穩定性。23 眼 (96%) 之角膜形狀,由術前扁長型該形態持續穩定變為扁圓型,且在其後 追�j中。放射狀角膜切開術後,在非球狀曲線呈明顯改變,且在其後追�j中持續存在。比較 不同追�j時段非球狀曲線及屈光率之改變速率變仇,顯示柱術後壹個月後,角膜曲率圖已呈 穩定狀態,且其後兩年追�j中並無有意義之變動,然而更長期之評估仍屬必需。 |
英文摘要 | Purpose. Computer-assisted videokeratography was used to assess the stability of comeal topography after radial keratotomy (RK). Methods. A total of 24 eyes of 24 patients who underwent 8-incision centrifugal RK were studied. Each eye received periodic videokeratographic examinations with Topographic Modeling System-1 preoperatively as well as at 1 week, and at 1, 3, 6 months, 1 year, and 2 years after surgery. Comeal asphericity and rate of change in dioptric power (dioptric gradient) were calculated along each of the four cardinal semimeridians at various time intervals to compare the changes in corneal topography. Results. Change in corneal shape, from a prolate to an oblate configuration, occurred in 23 eyes (96%) and these shapes persisted throughout the 2-year follow-up period. A paracentral knee at approximately 2.5 mm from the center was noted in the curves of dioptric gradient. Although the topographic changes were most notable at one week postoperatively, the differences among postoperative curves of corneal asphericity and dioptric gradient measured at each follow up interval were not statistically significant (all p > 0.05). Conclusions. Comparing the curves of comeal asphericity and dioptric gradient at various time intervals, it appeared that corneal topography has become stabilized at one month after the surgery and no significant shift was noted over the subsequent 2 years of follow-up. Further evaluation is needed to assess whether such stability will persist beyond 2 years of follow- up. |
本系統中英文摘要資訊取自各篇刊載內容。