Effects of head tilt on visual field testing with a head-mounted perimeter imo.
Effects of head tilt on visual field testing with a head-mounted perimeter imo.
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DOI：
10.1371/journal.pone.0185240
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Shimomura Y
中科院分区：
文献类型：
--
作者：
Yamao S;Matsumoto C;Nomoto H;Numata T;Eura M;Yamashita M;Hashimoto S;Okuyama S;Kimura S;Yamanaka K;Chiba Y;Aihara M;Shimomura Y
一种新开发的头戴式视野计，称为“imo”，可以在没有固定头部位置的情况下进行视野（VF）测试。由于受试者的头部和imo之间的位置关系是固定的，因此与使用固定视野计获得的结果相比，头部位置变化对测试结果的影响很小。然而，只有头部倾斜引起的眼反侧倾（OCR）可能会影响VF测试。为了定量地揭示头部倾斜和OCR对VF测试结果的影响，我们研究了头部倾斜角度、OCR幅度和VF测试结果之间的关系。对于20名健康受试者，我们双眼记录静态OCR（s-OCR），同时将受试者的头部以10°增量倾斜0°至60° θ或θ的任意角度。通过监测虹膜图案，我们评估了s-OCR幅度。我们还进行了盲点检测，同时以10°的增量将受试者的头部倾斜0°至50°的任意角度，以计算由于头部倾斜而导致盲点旋转的角度。s-OCR振幅与头倾斜角度之间呈正弦关系。在盲点检测中，盲点旋转方向与头部倾斜方向相反，并且盲点旋转角度与头部倾斜角度之间也呈现正弦关系。盲点的旋转角度与s-OCR振幅强相关（R2≥0.94，p<0.0001）。在imo下，头部倾斜大于20°会导致相邻测试区域之间的干扰。通过正弦回归分析，将盲点的s-OCR振幅和旋转角度与头部倾斜角度进行了相关分析。旋转VF与s-OCR振幅相关。在使用imo进行视野检查期间，受试者头部倾斜的变化应限制在20°以内。
A newly developed head-mounted perimeter termed “imo” enables visual field (VF) testing without a fixed head position. Because the positional relationship between the subject’s head and the imo is fixed, the effects of head position changes on the test results are small compared with those obtained using a stationary perimeter. However, only ocular counter-roll (OCR) induced by head tilt might affect VF testing. To quantitatively reveal the effects of head tilt and OCR on the VF test results, we investigated the associations among the head-tilt angle, OCR amplitude and VF testing results. For 20 healthy subjects, we binocularly recorded static OCR (s-OCR) while tilting the subject’s head at an arbitrary angle ranging from 0° to 60° rightward or leftward in 10° increments. By monitoring iris patterns, we evaluated the s-OCR amplitude. We also performed blind spot detection while tilting the subject’s head by an arbitrary angle ranging from 0° to 50° rightward or leftward in 10° increments to calculate the angle by which the blind spot rotates because of head tilt. The association between s-OCR amplitude and head-tilt angle showed a sinusoidal relationship. In blind spot detection, the blind spot rotated to the opposite direction of the head tilt, and the association between the rotation angle of the blind spot and the head-tilt angle also showed a sinusoidal relationship. The rotation angle of the blind spot was strongly correlated with the s-OCR amplitude (R2≥0.94, p<0.0001). A head tilt greater than 20° with imo causes interference between adjacent test areas. Both the s-OCR amplitude and the rotation angle of the blind spot were correlated with the head-tilt angle by sinusoidal regression. The rotated VF was correlated with the s-OCR amplitude. During perimetry using imo, the change in the subject’s head tilt should be limited to 20°.