异位症描述了在没有双眼融合的情况下光轴的偏离。眼动仪(ET)可以提供客观的评估,但在临床上并未广泛使用。我们研究了结合红外(IR)通过滤波器的可行性,红外探测器,还有现成的ET.所提出的设置已针对广泛使用的覆盖测试(CT)进行了验证。此外,该设置用于检查测试条件是否会影响测量。
将IR检测器连接到手持式IR通滤光器上,该滤光器阻挡可见光以提供遮挡,同时使IR光通过以进行眼睛跟踪。检测器感测眼睛跟踪器的IR照明,创建与SMIRed250跟踪器获取的眼睛位置同步的封堵器位置的可记录信号。每种条件的三次测量的平均值,三秒和十秒的闭塞,闭塞的眼睛,使用Wilcoxon检验比较ET和CT结果,相关性和布兰德和奥特曼地块。在2Δ内的测量之间的差异被认为是临床上不显著的。
招募了30名正常视力的受试者(平均年龄24.50±2.20,范围20-28),其异位症在14Δ外斜视和4Δ内斜视之间。闭塞的眼睛之间没有显着差异。然而,有3和10秒之间的差异\'覆盖持续时间。CT数据更类似于10秒的覆盖持续时间,尽管差异小于2Δ的临床分辨率。
廉价的现成ET可用于在受控测试参数的情况下测量异照虫。
我们的研究证明了一种强大的技术,用于同步光学元件,例如IR盖,用现成的商用眼动仪.光学元件与眼睛跟踪的同步,这里描述了异位症,可适用于其他临床测量。
Heterophoria describes the deviation of the optical axes in the absence of binocular fusion. Eye trackers (ET) can provide an objective assessment but are not broadly used clinically. We examined the feasibility of combining an infrared (IR) pass-filter, IR detector, and an off-the-shelf ET. The proposed setup was validated against the broadly used cover test (CT). Furthermore, the setup was used to examine whether testing conditions can affect the measurements.
An IR detector was attached to a handheld IR-pass filter that blocks visible light to provide occlusion while passing IR light for eye tracking. The detector senses the IR illumination of the eye tracker, creating a recordable signal of the occluder position synchronized with eye positions acquired by the SMI Red250 tracker. The mean of three measurements of each condition, three versus ten seconds occlusion, the occluded eye, and ET versus CT results were compared using the Wilcoxon test, correlation and Bland and Altman plots. Differences between measurements that were within 2Δ were considered clinically insignificant.
Thirty normally-sighted subjects (mean age 24.50 ± 2.20, range 20-28) with heterophoria ranging between 14Δ exophoria and 4Δ esophoria were recruited. There was no significant difference between the occluded eyes. However, there was a difference between 3 and 10 seconds\' cover duration. The CT data were more similar to the 10 seconds cover duration, although differences were less than the clinical resolution of 2Δ.
An inexpensive off-the-shelf ET can be used to measure heterophoria with controlled testing parameters.
Our study demonstrated a robust technique for synchronization of an optical element such as an IR cover, with an off-the-shelf commercial eye tracker. The synchronization of optical elements with eye tracking, which has been described here for heterophoria, can be adapted for other clinical measurements.