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手持放大镜对阅读速度的影响
引用本文:于旭东,王晨晓,蒋丽琴. 手持放大镜对阅读速度的影响[J]. 眼科, 2010, 19(2): 139-141
作者姓名:于旭东  王晨晓  蒋丽琴
作者单位:温州医学院附属眼视光医院,浙江省,325027
摘    要:
目的探讨手持放大镜对视力正常者和低视力患者阅读速度的影响。设计前瞻性对照研究。研究对象初次使用手持放大镜的低视力患者13例和37例视力正常者。方法分别测试视力正常者不用手持放大镜阅读小五号字及初次使用+10D、+20D两种不同度数的手持放大镜、采用10cm、35cm两种不同距离阅读小五号字时的速度;并测量低视力患者首次使用手持放大镜阅读小五号字和不用放大镜阅读相同放大率的大字印刷体的阅读速度。主要指标阅读速度(字数/分钟)。结果视力正常者不用手持放大镜的阅读速度(194.6±45.2字/分)比用+10D手持放大镜在眼睛到放大镜10cm(159.7±44.7字/分)、35em(162.5±46.7字/分)的阅读速度快,也比用+20D手持放大镜在眼睛到放大镜10em(150.3±43.3字份)、35cm(150.0±43.4字,分)的阅读速度快,差异有统计学意义(P=0.001、0.002、0.000、0.000);在相同放大倍率下,眼睛到放大镜的距离分别为10cm和35cm时,阅读速度的差异没有统计学意义(+10D,P=0.783;+20D,P=-0.981)。低视力患者首次使用手持放大镜阅读小五号字的速度(54.2±8.2字/分)比不用放大镜阅读相同放大率的大字印刷体的速度(64.0±9.4字/分)要慢,两者相比差别有统计学意义(P=0.000)。结论初次使用手持放大镜阅读者,无论是正常人还是低视力患者阅读速度均慢。因此低视力患者使用放大镜时要有熟练过程。(眼科,2010,19:139—141)

关 键 词:手持放大镜  低视力/治疗

The effect of handhold magnifier on reading speed
YU Xu-dong,WANG Chen-xiao,JIANG Li-qin. The effect of handhold magnifier on reading speed[J]. Ophthalmology in China, 2010, 19(2): 139-141
Authors:YU Xu-dong  WANG Chen-xiao  JIANG Li-qin
Affiliation:. (School of Optometry and Ophthalrnology, Wenzhou Medical College, Wenzhou 325027, China)
Abstract:
Objective To study the effect of using handhold magnifier on reading speed in patients with low vision and normal-sighted people. Design Prospective, control study. Participants Low vision (13 patients)and normal-sighted readers (37 persons) who use handhold magnifiers or the first time. Method Nine-point text was read by normal vision subjects without magnifier and then with two magnifiers with different magnification (±10 D, ±20 D) in different eye-to-magnifier distance (10 cm, 35 cm). Nine-point text was also read by low vision people with magnifiers. The big printed text under the same magnification without magnifier was also read by low vision group. Reading speed was recorded. Main Outcome Measures Reading speed (words per minute). Result For normal vision subjects, reading speed without magnifier (194.6±45.2 words/min) is faster than that with a 10D magnifier in an eye-to-magnifier distance of lOem (159.7±44.7 words/min) (P=0.001), and distance of 35cm (162.5-±46.Twords/min) (P=0.002), respectively. Reading speed without magnifier is also faster than that with a 20D magnifier in an eye-to-magnifier distance of 10cm (150.3±43.3 words/min) (P〈0.001), and distance of 35cm (150.0±43.4 words/min) (P〈0.001), respectively. For the same magnification, different eye-to-magnifier distance (10cm or 35cm) did not affect reading speed (10D, P=0.783; 20D, P=0.981). For low vision patients who firstly used magnifier, reading speed with magnifier (54.2±8.2 words/min) was slower than that of reading big-printed material under the same magnification (64.0±9.4 words/min ) (P〈0.0001). Conclusion For persons who newly using magnifier, reading speed was reduced and maximal speed could not be achieved because of the presence of learning effect, including leaning how to coordinate hand and eye and how to locate the first word on the next line. (Ophthalmol CHN, 2010, 19: 139-141)
Keywords:handhold magnifier  low vision/treatment
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