光散射式遮盖隐斜视量测技术

Technique of Measuring the Heterophoria by Diffuser Cover Test

隐斜视是眼睛在没有双眼融像时,两眼视线的相对偏差。双眼融像可以透过一些方法来抑制,例如,受测者注视远方目标物,以遮盖板遮盖一只眼,然后验光师观察另一只眼,若未遮盖之眼有偏离初始位置,则被检者可能有隐斜视。遮盖测试在临床试验是一种非常重要方法,常被用于评估与诊断非斜视性的两眼功能障碍例如会聚不足。传统临床方法如遮盖测试或改良式索灵顿测试(Thorington test)受主观的限制,无法观察到被遮盖眼眼位移动。本研究使用光散射式遮盖板与眼位影像捕获装置进行隐斜视测量,利用8051单芯片与PWM方法控制直流马达驱动遮盖板,完成遮盖板的快速翻转。本装置用于两眼遮盖交替及单眼遮盖检测,可有效进行斜位快筛。利用CCD摄影捕获设备与马达带动光散射式遮盖板翻转,快速且精准检查眼球运动及其它眼疾症状,可以抑制视觉恶化严重的问题。

Heterophoria is the relative deviation of two eyes’ line of sight when there is no binocular fusion. The binocular fusion image can be suppressed by some methods, for example, the subject looks at a distant target to cover one eye with a cover plate, and then the optometrist observes the other eye. If the uncovered eye deviates from the initial position, the subject may have heterophoria. Cover test is a very important method in clinical trials, which is often used to evaluate and diagnose non-strabismus binocular dysfunction, such as convergence insufficiency. Traditional clinical methods, such as the cover test or the modified Thorington test, are limited by subjective factors and cannot observe the movement of the heterophoria eye. In this study, the light scattering cover plate and eye position image capture device are used to measure the heterophoria, and 8051 single chip and PWM method are used to control the DC motor to drive the cover plate to complete the fast flip of the cover plate. The device is used for testing the alternation of two eyes covering and single eye covering, and can effectively carry out the heterophoria quick screen. The use of a CCD camera capture device and a motor to drive the optical diffuser cover plate to turn over can quickly and accurately check eye movements and other symptoms of eye diseases, which can suppress serious visual deterioration.