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題名:以自組之頭盔式電子影像放大器改善低視能患者閱讀能力之臨床研究     (14點)
CLINICAL STUDY ON READING IN LOW-VISION PATIENTS WITH A SIMPLIFIED HEAD-MOUNTED VIDEO MAGNIFIER
著者:孫?欽(Chi-Chin Sun) ;葉佰蒼(Bie-Tsung Yeh) ;陳信誌(Hsin-Chih Chen) ;李明義(Ming-Yih Lee) ;林耕國(Ken-Kuo Lin) ;李建興(Jiahn-Shing Lee)
出版地區:台灣
出版城市:台北市
學科:醫學綜合
關鍵字:low-vision ; closed-circuit television ; head-mounted display ; reading
刊名:中華民國眼科醫學會雜誌
卷期:40卷4期(2001.12)
頁碼:533-539
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

目的:頭盔式電子影像放大器兼具擴視機的優點及光學放大鏡的可攜性,但因售價高昂,且國內尚無生產或進口代理廠商,因此維修不易;本研究係以市售針孔攝影機及頭盔式顯示器等,自行組裝一組須盔式電子影像放大器,並以國外進口Magni-CamTM手持式擴視機及電腦螢幕做為比較,進行臨床應用評估。 方法:(一)以測量正常人的近讀視力,分別比較使用:(l)針孔攝影機與Magni-CamTM鏡頭,及(2)頭盔式顯示器與電腦螢幕,在解析度上的差異。(二)評估低視能患者使用此頭盔式電子影像放大器前後的閱讀速度,及維持最大閱讀速度之字體大小臨界值。 結果:(一)在相等放大倍率(6倍)下,正常視力者使用針孔攝影機與Magni-CamTM鏡頭,所能看到的最小字體相近;而使用頭盔式顯示器比使用電腦螢幕所能看到的解析度差0.1 log MAR (logarithm of minimum angle of resolution)單位。(二)九位受測的低視能患者中,有一位(優眼矯正視力在0.01以下)無法藉頭盔式電子影像放大器改善閱讀能力,其餘八位(優眼矯正視力在0.06到0.2之間)未使用頭盔式電子影像放大器閱讀之臨界字體值平均為0.90 logMAR,使用後進步為0.34 logMAR,且兩者的最大閱讀速度並無差異。 結論:雖然自組的頭盔式電子影像放大器在解析度上稍遜於電腦螢幕,但除了視力極差的視障者外,應可提供多數低視能患者在閱讀上的輔助。
Purpose: Head-mounted video magnifier combines the advantages of the closed-circuit television (CCTV) arid the portability of optical magnifiers. The disadvantages are its high cost and poor technical service in Taiwan. In this study, we assembled a simplified head-mounted video magnifier (HMVM) and evaluated its effectiveness in low vision clinic. Method: 1. The reading acuity of five normal- vision participants was assessed by using (A) our miniature TV camera versus Magni-CamTM camera, and (B) head-mounted display (HMD) versus super video graphs array (SVGA), to compare the resolution of these instruments. 2. The reading performance was measured with and without using this simplified HMVH in nine low-vision patients to assess its clinical effectiveness. Results: 1. Under 6X magnification, the reading acuity of normal subjects was similar by using our miniature TV camera and Magni-CamTM camera. However, their reading acuity was better by using SVGA than HMD by 0.1 1ogMAR unit. 2. The critical print size improved significantly, average from 0.90 logMAR to 0.34 1ogMAR, for all low-vision patients except one with poorest acuity (less than 0.01). Besides, maximum reading speeds with this device matched the maximum reading speeds with unaided vision attained by enlarging print. Conclusion: Our simplified HMVM, with comparable resolution to CCTV, can support good reading performance in most low-vision patients except those with very poor acuity.


    

本卷期目次
中華民國眼科醫學會雜誌 40卷4期 (2001.12)
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