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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)、35cm(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10cm(150.3±43.3字/分)、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。
Objective To explore the effect of hand-held magnifying glass on reading speed in normal and low vision patients. Design prospective controlled study. Participants Thirteen patients with low vision and 37 patients with normal vision who used handheld magnifier for the first time. Methods were normal eyesight test without reading a small hand-held magnifying glass and the first use of the word +10 D, +20 D two different degrees of handheld magnifying glass, using 10cm, 35cm two different distances read the word speed of the small five; and measure low For the first time, visually impaired people use handheld magnifiers to read small 5 characters and read the same large-size large-size print without a magnifying glass. The reading speed of major indicators (number of words / minute). The results of normal vision without hand-held magnifying glass reading speed (194.6 ± 45.2 words / min) than with a +10 D handheld magnifying glass in the eyes to the magnifying glass 10cm (159.7 ± 44.7 words / min), 35cm (162.5 ± 46.7 words / min) Fast, and also faster than reading with a + 20D hand-held magnifying glass in the eye to the magnifying glass 10cm (150.3 ± 43.3 words / minute), 35cm (150.0 ± 43.4 words / minute), the difference was statistically significant (P = 0.001,0.002,0.000 , 0.000). There was no significant difference in reading speed at the same magnification between the eyes and the magnifier of 10 cm and 35 cm, respectively (+ 10D, P = 0.783; + 20D, P = 0.981). For the first time, patients with low vision had a slow reading speed of 54 characters (54.2 ± 8.2) per second with a hand-held magnifying glass and a slower speed (64.0 ± 9.4 words / minute) than those with the same magnification reading without a magnifying glass The difference was statistically significant (P = 0.000). Conclusion For the first time using a handheld magnifier reader, both normal and low-vision patients are slow to read. Therefore, patients with low vision use a magnifying glass to have a skilled process.