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Impact of high power and angle of incidence on prism corrections for visual field loss

机译：大功率和入射角对用于视野损失的棱镜校正的影响

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摘要

Prism distortions and spurious reflections are not usually considered when prescribing prisms to compensate for visual field loss due to homonymous hemianopia. Distortions and reflections in the high-power Fresnel prisms used in peripheral prism placement can be considerable, and the simplifying assumption that prism deflection power is independent of angle of incidence into the prisms results in substantial errors. We analyze the effects of high prism power and incidence angle on the field expansion, size of the apical sco-tomas, and image compression/expansion. We analyze and illustrate the effects of reflections within the Fresnel prisms, primarily due to reflections at the bases, and secondarily due to surface reflections. The strength and location of these effects differs materially depending on whether the serrated prismatic surface is placed toward or away from the eye, and this affects the contribution of the reflections to visual confusion, diplopia, false alarms, and loss of contrast. We conclude with suqqestions for controllinq and mitigating these effects in clinical practice.
机译：在规定棱镜以补偿由于同名偏盲造成的视野损失时，通常不考虑棱镜畸变和伪造反射。外围棱镜放置中使用的大功率菲涅耳棱镜中的畸变和反射可能会很大，并且简化的假设（即棱镜的偏转能力与入射到棱镜的入射角无关）会导致较大的误差。我们分析了高棱镜功率和入射角对视场扩展，顶视镜大小和图像压缩/扩展的影响。我们分析和说明菲涅耳棱镜内的反射效应，主要是由于底面的反射，其次是表面反射。这些效果的强度和位置在很大程度上取决于锯齿状棱柱形表面是朝向还是远离眼睛放置，并且会影响反射对视觉混乱，复视，错误警报和对比度下降的影响。我们总结了一些可控制的物质，并在临床实践中减轻了这些影响。

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