Schuchard R A
Lions Vision Center, Wilmer Institute, Johns Hopkins University School of Medicine, Baltimore, Md.
Arch Ophthalmol. 1993 Jun;111(6):776-80. doi: 10.1001/archopht.1993.01090060064024.
To compare the reports of scotomas and metamorphosia in standard and threshold Amsler grid testing with the location and extent of scotomas in the macular region as determined by standard and threshold fundus perimetry.
Fundus perimetry determined the existence, size, and retinal location of macular scotomas. Amsler grid testing was performed with the scanning laser ophthalmoscope and the TA-300 system (Stereo Optical, Chicago, Ill). All testing was done at both standard and threshold light conditions.
Fifty-five patients with vision loss in the macular region and 10 normally sighted subjects.
Nearly half of the standard and threshold scotomas were not detected by Amsler grid testing. For scotomas of 6 degrees or less in diameter, 77% of standard and 87% of threshold scotomas were not detected by Amsler grid testing. Of the eyes with central scotomas involving the fovea, 66% used an eccentric preferred retinal locus for fixating the center of the grid. Finally, more than half of the distortion reported in Amsler grids was at the retinal area that corresponded to the scotoma area, not a nonscotoma retinal area.
Amsler grid reports have poor validity and cannot be accurately interpreted for use in the clinical diagnosis of retinal defects.
比较标准和阈值Amsler方格表检查中暗点和视物变形的报告，以及通过标准和阈值眼底视野检查确定的黄斑区暗点的位置和范围。
眼底视野检查确定黄斑暗点的存在、大小和视网膜位置。使用扫描激光检眼镜和TA - 300系统（Stereo Optical，芝加哥，伊利诺伊州）进行Amsler方格表检查。所有检查均在标准和阈值光照条件下进行。
55例黄斑区视力丧失患者和10例视力正常的受试者。
近一半的标准和阈值暗点未被Amsler方格表检查检测到。对于直径6度或更小的暗点，77%的标准暗点和87%的阈值暗点未被Amsler方格表检查检测到。在涉及中央凹的中央暗点的眼中，6%使用偏心的首选视网膜位点来注视方格表的中心。最后，Amsler方格表中报告的超过一半的变形发生在与暗点区域相对应的视网膜区域，而非非暗点视网膜区域。
Amsler方格表报告的有效性较差，不能准确解释用于视网膜缺陷的临床诊断。
