Preferred retinal loci relationship to macular scotomas in a low-vision population
Preferred retinal loci relationship to macular scotomas in a low-vision population
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DOI：
10.1016/s0161-6420(97)30260-7
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发表时间：
1997-04-01
期刊：
影响因子：
13.7
通讯作者：
Schuchard, RA
中科院分区：
文献类型：
--
作者：
Fletcher, DC;Schuchard, RA
目的：作者确定的模式，在首选视网膜位点（PRL）的能力和位置相对于黄斑暗点在law vision patient population.Methods：扫描激光检眼镜黄斑视野检查和PRL测试825例低视力患者进行。PRL的位置被确定，并设计了一个PRL评分系统，并用于测量的追求能力，固定稳定性，扫视能力的PRL。结果：84%（1130/1339眼）的眼睛有一个既定的PRL。首选的视网膜位点在能力评分的整个范围内变化，固定稳定性的大小从1.0度到9.0度不等。82.5%的眼有中心性致密暗点，8.4%的眼有旁中心性致密暗点。在14.8%的眼睛中，PRL在其任何边界上都没有致密暗点;在39.7%、19.0%、9.0%和17.4%的眼睛中，分别有一个、两个、三个或四个（环形）边界有致密暗点。当PRL只有一个暗点的边界，由此产生的领域缺陷位于上级在39.0%，33.2%，19.9%，7.5%的eyes.Conclusions：大多数患者的低视力，多达四个的五个病人，有密集的暗点包围PRL的视觉任务。大约六分之一的低视力患者的PRL完全被密集的暗点包围。视觉系统显示出一种强烈的倾向，不把PRL解剖学上的暗点（以下固定场缺陷）和较弱的倾向，不把PRL解剖学上的暗点的权利（固定场缺陷的左边）。黄斑视野检查和PRL评估可以提供相当多的信息，黄斑的功能状态，这可能是有用的康复专业人员。
Purpose: The authors identified patterns in preferred retinal locus (PRL) ability and location relative to macular scotomas in a law-vision patient population.Methods: Scanning laser ophthalmoscope macular perimetry and PRL testing were performed on 825 patients with low vision. The PRL location was determined, and a PRL scoring system was devised and used to measure the pursuit ability, fixation stability, and saccadic ability of the PRL. The characteristics of dense scotomas within 2.5 degrees of the PRL were noted.Results: Eighty-four percent (1130 of 1339 eyes) of the eyes had an established PRL. Preferred retinal loci varied across the full range of ability scores and varied in size for fixation stability from 1.0 degrees to 9.0 degrees in diameter. There was a central dense scotoma in 82.5% of the eyes, whereas 8.4% had a paracentral dense scotoma. In 14.8% of the eyes, the PRL had no dense scotomas on any of its borders; one, two, three, or four (a ring) borders had a dense scotoma in 39.7%, 19.0%, 9.0%, and 17.4% of eyes, respectively. When the PRL had only one scotomatous border, the resulting field defect was located superior in 39.0%, right in 33.2%, left in 19.9%, and inferior in 7.5% of eyes.Conclusions: The majority of patients with low vision, as many as four of five patients, have dense scotomas encumbering the PRL for visual tasks. Approximately one of six patients with low vision have the PRL completely surrounded by dense scotomas. The visual system shows a strong tendency not to place a PRL anatomically above a scotoma (field defect below fixation) and a weaker tendency not to place the PRL anatomically to the right of a scotoma (field defect to the left of fixation). Macular perimetry and PRL evaluations can provide considerable information on the functional status of the macula, which may be useful to rehabilitation professionals.