闪光临界融合频率训练对提高视敏度的影响

Effect of critical flicker frequency training on enhancing the visual acuity

目的:观察采用JGW-B1型心理实验台光点闪烁仪部分测定时间视敏度,并以闪光临界融合频率的训练方法对健康志愿者空间和时间视敏度的影响。方法:①从许昌学院教育科学系应用心理学专业学生中通过自愿报名的方法获得30余名志愿者。最终确定26名既对本实验感兴趣又能够坚持1个月训练的同学作为被试。这些被试中有男性14名,女性12名;年龄18～22岁。②对于所有被试的优势眼和非优势眼加以区分;规定5m为标准距离,被试双眼裸视,采用“E”型视标的医用国际标准视力表灯测定空间视敏度;采用JGW-B1型心理实验台光点闪烁仪部分测定时间视敏度。2005-11-07开始第1次实验,测出全体被试的优势眼和非优势眼的空间视敏度和时间视敏度。2005-11-08/12-06每天利用课余时间进行1h的闪光临界融合频率训练,即双眼裸视暴露于观察视场中,中途出现复视、自主运动等视觉异常现象可不理会。每隔5min可休息30min。经过了近1个月的训练后对被试的空间视敏度和时间视敏度进行第2次测定。③采用Spearman等级相关分析确定空间视敏度和时间视敏度相关性。组内计量资料差异比较采用配对t检验。结果:学生26名均进入结果分析。①训练后视敏度变化:训练后被试的优势眼空间视敏度和时间视敏度分别为1.008±0.285,(37.066±3.856)Hz,明显高于训练前0.912±0.341,(34.211±3.066)Hz(t=5.13,10.48,P<0.01)。被试的非优势眼空间视敏度和时间视敏度分别为1.054±0.280,(34.634±3.579)Hz,明显高于训练前0.923±0.337,(31.280±3.438)Hz(t=6.85,5.56,P<0.01)。②空间视敏度与时间视敏度之间的相关性:训练前被试的优势眼空间视敏度与时间视敏度呈明显正相关(r=0.925,P<0.01),训练后优势眼两种视敏度呈明显正相关(r=0.847,P<0.05)。训练前被试的非优势眼空间视敏度与时间视敏度呈明显正相关(r=0.966,P<0.01),训练后非优势眼两种视敏度呈明显正相关(r=0.667,P<0.05)。结论:闪光临界融合频率训练是提高时间和空间视敏度的有效方法。

AIM： To determine the temporal acuity with JGW-B1 psychological experimental desk flicker apparatus, and improve the horary visual acuity of subjects with critical flicker frequency （CFF） training method. METHODS： （1） More than 30 subjects were selected from voluntary students major in Psychology of Department of Educational Science, Xuchang College. Twenty-six students, who were interested in the experiment and accomplished one-month training, were finally enrolled, including 14 males and 12 females with the age ranged from 18 years to 22 years. （2） Subjects were divided into dominant eyes and recessive eyes. All the subjects were determined of naked eyes with ＂E＂ International Standard visual Table for the double eyes＇ space visual acuity at 5m away. JGW-B1 was used to determine the horary visual acuity with flicker apparatus. The first experiment was conducted on 7^th November 2005, aiming at inspecting the spacial and horary visual acuity of all subjects with dominant eyes and recessive eyes. CFF training was conducted in all subjects one hour per day at spare time between 8^th November and 6^th December 2005, i.e. Subjects＇ naked eyes were exposed to angular field without considering abnormal anomalopia such as diplopia and automatic action. Subjects rested for 30 minutes every 6 minutes. A second determination of the spacial and horary visual acuity was performed post one-month training. （3） Correlation between spacial visual acuity and horary visual acuity was analyzed withSpearman method, and differences of measurement data in group were compared with paired t test. RESULTS： A total of 26 students were involved in the analysis of results. （1） Changes in visual acuity after training： The spacial visual acuity and horary visual acuity of subjects with dominant eyes were （1.008±0.285） and （37.066±3.856） Hz respectively, which were obviously higher than those before the treatment （0.912±0.341 ） and （34.211±3.066） Hz, （t =5.13, 10.48, P 〈 0.01）, while those of subjects with recessive eyes were （1.054±0.280） and （34.634±3.579） Hz respectively, which were remarkable higher than those before training （0.923±0.337）, （31.280±3.438） Hz, （t =6.85, 5.56, P 〈 0.01）. （2） Correlation between spacial visual acuity and horary visual acuity： They were remarkably in positive correlation before the training in subjects of dominant eyes （r =0.925,P 〈 0.01）, and so was it after the training （r =0.847,P 〈 0.05）; and they were obviously in positive correlation in subjects of recessive eyes before the training （r =0.966, P 〈 0.01 ）, and so was it after the training （r=0.667, P 〈 0.05）. CONCLUSION： CFF training is an effective method for raising spacial and horary visual acuity.