自适应视力检测法的设计与仿真研究

Design and simulation of computerized tumbling E test

目的设计一种新的视力检测方法——自适应视力检测法,探讨自适应视力检测法的实际应用价值。方法通过计算机仿真实验考察自适应视力检测法的可行性。以仿真实验为基础,分别用40trials、80trials的自适应视力检测法及标准对数视力表(随机次序)对30名受试者[(26.1±4.7)岁,男18名、女12名]进行双眼视力检查。用自适应视力检测法检查结果与标准对数视力表检查结果的一致性限度评价其准确性,用配对样本t检验评价两种检查方法的相关性和差异性。结果受试者的视力检查结果显示40trials的自适应视力检测法检查结果与标准对数视力表检查结果间差异无统计学意义,但80trials的自适应视力检测法检查结果与标准对数视力表检查结果间差异有统计学意义(P<0.05)。结论在合理的检查次数内(40trials),自适应视力检测法与标准对数视力表在成人视力检查中一致性较好。与标准对数视力表相比,自适应视力检测法有避免视标记忆问题、减小视觉拥挤效应等优势,具有实际应用价值。

ObjectiveTo design a new method for visual acuity test naming computerized tumbling E test,and to explore the application of computerized tumbling E test.MethodsThe feasibility of computerized tumbling E test was investigated by computer simulation experiment.Based on the simulation experiment,a total of30subjects([26.1±4.7]years old,18males and12females)received binocular vision acuity examination by computerized tumbling E test with40trials or80trials and standard logarithmic visual acuity chart(random sequence),respectively.The accuracy of computerized tumbling E test was evaluated by comparing the consistency limit with standard logarithmic visual acuity chart.The correlation and difference between the two tests were evaluated by paired samples t test.ResultsThere was no significant difference between the results of the computerized tumbling E test with40trials and standard logarithmic visual acuity chart,while the difference between the results of the80trials and standard logarithmic visual acuity chart was statistically significant(P<0.05).ConclusionThe consistency is good for adult visual test using the computerized tumbling E test with reasonable number of trials(40trials)and the standard logarithmic visual acuity chart.Compared with the standard logarithmic visual acuity chart,computerized tumbling E test has advantages such as avoiding the problem of optotype memory and reducing the visual crowding effect,showing practical application value(P<0.05).