Study of automated perimetry

我们修改了一个自动投影静态周长，它可以在光适应和暗适应状态下测量三种不同波长的光的阈值。该仪器可在72度视野范围内分别评价杆机构和锥机构的相对状态。这些修改也使黑暗适应的双色静态视野定量地跨越视野，包括轮廓测量。我们研究了使用改进的Humphrey Field Analyzer （HFA）测量曾经脱离视网膜的视锥和视杆阈值的静态灵敏度恢复。两组术前有或无黄斑受累，术后黄斑敏感性恢复良好，均行中央凹锥密度测定。术前HFA检测到的恶化在棒敏感性丧失中更为突出。锥和杆的敏感性在术后1个月内迅速恢复，随后逐渐恢复至6个月。直到术后3个月，杆状体的恢复比锥体慢。在黄斑受累且术后黄斑敏感性恢复良好的患者中，视力的恢复是可变的。中央凹视锥密度测定显示，视力恢复不佳的同时，视锥色素的再生也不佳。这些结果表明，即使心理物理敏感性恢复到正常水平，黄斑脱离仍存在锥体外段功能异常。

We modified an automated projection static perimeter which can measure thresholds with lights of three different wavelengths in light-adapted as well as in dark adapted state. This instrument can evaluate relative states of rod and cone mechanisms respectively within the visual field range of 72 degrees. These modifications also enable dark-adapted two-color static perimetry quantitatively across the visual field including profile measurement.We studied the recovery of static sensitivity using modified Humphrey Field Analyzer (HFA) to measure cone and rod threshold in once detached retina. Also foveal cone densitometry was done in two groups with or without preoperative macular involvement accompanied with a good postoperative recovery of macular sensitivity. Preoperative deterioration detected with HFA was more prominent in rod sensitivity loss. Cone and rod sensitivity recovered rapidly in postoperative one month, followed by gradual recovery up to six months. Rod rocovery was slower than cone until postoperative three months. Among patients with macular involvement and a good recovery of macular sensitivity after surgery, the recovery of visual acuity was variable. Foveal cone densitometry revealed that poor recovery of Visual acuity was accompanied by poor regeneration of cone pigments. These results suggest that functional abnormalities of cone outer segments are present in macular detachment which persist in reattached macula even when the psychophysical sensitivity recovers to normal level.