Gustafsson Jörgen, Unsbo Peter
Department of Design Sciences, Lund University, Sweden.
Optom Vis Sci. 2003 Jul;80(7):535-41. doi: 10.1097/00006324-200307000-00015.
Subjects with absolute central visual field loss use eccentric fixation and magnifying devices to utilize their residual vision. This preliminary study investigated the importance of an accurate eccentric correction of off-axis refractive errors to optimize the residual visual function for these subjects.
Photorefraction using the PowerRefractor instrument was used to evaluate the ametropia in eccentric fixation angles. Methods were adapted for measuring visual acuity outside the macula using filtered optotypes from high-pass resolution perimetry. Optical corrections were implemented, and the visual function of subjects with central visual field loss was measured with and without eccentric correction.
Of the seven cases reported, five experienced an improvement in visual function in their preferred retinal locus with eccentric refraction.
The main result was that optical correction for better image quality on the peripheral retina is important for the vision of subjects with central visual field loss, objectively as well as subjectively.
绝对中心视野丧失的受试者使用偏心注视和放大设备来利用其残余视力。这项初步研究调查了准确矫正离轴屈光不正对优化这些受试者残余视觉功能的重要性。
使用PowerRefractor仪器进行摄影验光，以评估偏心注视角度下的屈光不正。采用来自高通分辨率视野计的滤过视标，对测量黄斑外视力的方法进行了调整。实施了光学矫正，并测量了中心视野丧失受试者在有和没有偏心矫正情况下的视觉功能。
在报告的7例病例中，5例在偏心屈光后其首选视网膜位点的视觉功能得到改善。
主要结果是，在外周视网膜上进行光学矫正以获得更好的图像质量，对中心视野丧失受试者的视力在客观和主观上都很重要。
