Reading with a macular scotoma. I. Retinal location of scotoma and fixation area.
Reading with a macular scotoma. I. Retinal location of scotoma and fixation area.
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DOI：
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发表时间：
1986-07
影响因子：
4.4
通讯作者：
George T. Timberloke;Martin A. Mainsrer;E. Peli;R. Augliere;E. Essock;L. Arend
中科院分区：
文献类型：
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作者：
George T. Timberloke;Martin A. Mainsrer;E. Peli;R. Augliere;E. Essock;L. Arend
为了研究黄斑暗斑患者如何利用残余功能视网膜区域检查视觉细节，使用扫描激光检眼镜（SLO）绘制暗斑的视网膜位置和用于注视的区域。本研究测试了3例持续时间至少20个月且未接受明确低视力训练的密集黄斑暗斑患者。SLO刺激是通过计算机调制扫描激光束产生的，并且可以通过在电视监视器上直接观察视网膜放置在已知的视网膜位点上。对录制的SLO图像进行分析，生成视网膜图，该图校正了因注视眼运动而引起的刺激位置变化，从而显示了暗斑和注视位点的真实视网膜位置。主要调查结果如下：1)每位患者都使用紧靠暗点的单一特异性视网膜区域进行固定，而不尝试使用无功能的中央凹；2)偏心固定位点的固定稳定性与视力正常受试者在类似偏心位置进行固定的稳定性一样好，甚至更好；3)固定稳定性与临床视力没有系统的关系。4)这3例患者的SLO形状和总体大小与标准临床切线屏幕暗点图有很好的一致性。
To investigate how patients with macular scotomas use residual functional retinal areas to inspect visual detail, a scanning laser ophthalmoscope (SLO) was used to map the retinal locations of scotomas and areas used to fixate. Three patients with dense macular scotomas of at least 20 months duration and with no explicit low vision training were tested. SLO stimuli were produced by computer modulation of the scanned laser beam, and could be placed on known retinal loci by direct observation of the retina on a television monitor. Videotaped SLO images were analyzed to produce retinal maps that are corrected for shifts of stimulus position due to fixational eye movement, thus showing the true retinal locations of scotomas and fixation loci. Major findings were as follows: 1) each patient used a single, idiosyncratic retinal area, immediately adjacent to the scotoma to fixate, and did not attempt to use the nonfunctional foveola, 2) fixation stability with the eccentric fixation locus was as good as, or better than, that of ocularly normal subjects trying to fixate at comparable eccentricities, 3) fixation stability was not systematically related to clinical visual acuity, and 4) there is good agreement as to the shape and overall size of SLO and standard clinical tangent screen scotoma maps for these three patients.