Gazarek S, Henning G, Müller W
Institut für Biomedizinische Technik und Informatik, Technische Universität Ilmenau.
Ophthalmologe. 1995 Apr;92(2):113-9.
Measuring and evaluating locally generated VECP present a chance to overcome methodical restriction in conventional subjective perimetry. To achieve this, stimuli are required which ensure the generation of detectable responses under controlled scattered light influence. The suitability of LED for this task was studied. LED stimuli (lambda = 560 nm) were moved in steps of 3 degrees from 0 degree to 30 degrees on the horizontal meridian within a perimeter sphere. The stimuli were 0.8 degree and 1.7 degrees in size, 20 ms in duration and 0.5 Hz in frequency. The background illumination was 10 cd/m2. A total 467 responses recorded from 20 volunteers (age 26 +/- 2) known to be free of any visual field defect have been evaluated. Using only one LED (size 0.8 degree) VECPs are detectable in the visual field < 9 degrees exclusively. An increase of stimuli size to 1.7 degrees made the generation of detectable VECP within the peripheral visual field possible. Statistical evaluation (sign test) proved significantly that VECP can be reliably elicited under LED stimulation. LED (lambda = 560 nm) are suitable for the generation of localized VECP in the visual field up to an eccentricity of 30 degrees.
测量和评估局部产生的矢量眼电图（VECP）为克服传统主观视野检查中的方法限制提供了契机。要实现这一点，需要能在可控的散射光影响下确保产生可检测反应的刺激。研究了发光二极管（LED）用于此任务的适用性。在周边视野球内，波长为560纳米的LED刺激以3度步长从0度移动到30度在水平子午线上。刺激大小为0.8度和1.7度，持续时间为20毫秒，频率为0.5赫兹。背景照明为10坎德拉每平方米。对20名已知无任何视野缺陷的志愿者（年龄26±2岁）记录的总共467个反应进行了评估。仅使用一个大小为0.8度的LED时，仅在视野小于9度时可检测到VECP。将刺激大小增加到1.7度使得在周边视野中产生可检测的VECP成为可能。统计评估（符号检验）显著证明在LED刺激下可可靠引出VECP。波长为560纳米的LED适用于在视野中产生局部VECP，直至偏心度为30度。
