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題 名 | Correlations between C-scan Ray Tracing Module and Visual Performance in Normal Cornea and Post-LASIK Patients=C掃描光線追蹤模式和視覺表現在正常角膜及LASIK術後病人的相關性 |
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作 者 | 李原傑; 胡芳蓉; 王一中; | 書刊名 | 慈濟醫學 |
卷 期 | 14:5 2002.10[民91.10] |
頁 次 | 頁281-287 |
分類號 | 416.703 |
關鍵詞 | C掃描光線追蹤模式; 最佳眼鏡矯正視力; 對比敏感度相對視力; C-scan ray tracing module; Best spectacle-corrected visual acuity; Contrast sensitivity equivalent acuity; |
語 文 | 英文(English) |
中文摘要 | 目的:C掃描的角色介於傳統角膜地圖儀和完整光線波前誤差檢測儀之間。而C掃描光線追蹤模式可以根據角膜的成像以及瞳孔的大小,計算出可能的視力。本研究的目的,在於評估依據C掃描光線追蹤模式算出來的可能角膜視力(PCVA),和實際上最佳眼鏡矯正視力(BSCVA)以及MCT8000所提供的對比敏感度相對視力(CSEA)之間的相關性。病人與方法:本研究包含共68個正常角膜眼睛以及120個LASIK術後的眼睛,分別在白天和夜晚狀況下檢測其BSCVA、CSEA及PCVA,並計算其相關性。結果:在正常角膜眼睛,PCVA在白天狀況下和BSCVA(p=0.003)以及CSEA(p<0.001)都有顯著相關;在夜晚狀況下只與CSEA有顯著相關(p<0.001)。在LASIK術後眼睛,PCVA在白天狀況下只與CSEA有顯著相關(p=0.003);但在夜晚狀況下與BSCVA(p=0.818)以及CSEA(p=0.141)都無顯著相關。結論:C掃描光線追蹤模式對正常角膜眼睛在白天狀況下的視覺表現有好的預測能力,但是對LASIK術後眼睛在夜晚狀況下的視覺表現,其預測準確度仍有待進一步改善。 |
英文摘要 | Objective: C-Scan Ray Tracing is a technique somewhere between conventional corneal topography and true wavefront aberration sensing. The aim of the C-Scan Ray Tracing program is to calculate and represent the imaging characteristics of the cornea, in order to help assess the possible visual acuity. The purpose of this study was to evaluate the correlation between potential corneal visual acuity (PCVA) from the C-Scan, best spectacle-corrected visual acuity (BSCVA), and contrast sensitivity equivalent acuity (CSEA) from the MCT 8000. Patients and Methods: This study included a total of 68 eyes with normal corneas and 120 post-LASIK eyes. BSCVA, MCT 8000, and C-Scan were performed in both daytime and nighttime conditions. The correlation was calculated by the Kendall's correlation coefficient. Results: In normal cornea eyes, PCVA correlated with BSCVA (p=0.003) and CSEA (p<0.001) in daytime conditions, but correlated only with CSEA (p<0.001) in nighttime conditions. In post-LASIK eyes, PCVA correlated only with CSEA (p=0.003) in daytime conditions, and had no significant correlation with BSCVA (p=0.818) or CSEA (p=0.141) in nighttime conditions. Conclusions: C-Scan Ray Tracing module has good predictability for visual performance in daytime conditions for normal cornea eyes. However, it has some limitations in predicting precise visual performance of post-LASIK eyes and at nighttime conditions. |
本系統中英文摘要資訊取自各篇刊載內容。