Peli E
The Schepens Eye Research Institute, Harvard Medical School and New England Eye Center, New England Medical Center Hospitals, Tufts University School of Medicine, Boston, Massachusetts 02114, USA.
Optom Vis Sci. 2000 Sep;77(9):453-64. doi: 10.1097/00006324-200009000-00006.
To describe a novel method for prism correction of hemianopia that provides field-of-view expansion in a convenient and functional format and to evaluate initial clinical application.
To expand the upper quadrant of the field, a high power prism segment (30-40delta) is placed base-out across the upper part of the spectacle lens, on the side of the loss, at about the level of the limbus. A similar prism segment at the lower part of the lens is used to treat the lower field. The peripheral location of the prisms causes peripheral exotropia. As a result a scene segment as high as the vertical span of the prism is shifted laterally by 15 to 20 degrees relative to the view of the other eye. At the edge of the hemianopic field loss, objects that would fall in the scotoma of one eye are seen through the prism in the other eye, providing a simultaneous awareness of details within the otherwise absent field-of-view. An approach for fitting the system to patients with abnormal binocular vision (strabismus and amblyopia, with or without diplopia) is discussed as well. The effect of the prisms was evaluated in a noncomparative case series (12 patients).
The field expansion is provided at any position of lateral gaze, including gaze away from the side of the scotoma. The effect of this technique on field expansion was demonstrated using standard binocular perimetry. Most patients reported substantial improvement in function and in obstacle avoidance.
A novel method for the optical treatment of hemianopia was developed and tested. It was found to be effective in expanding the field and helping patients' mobility.
描述一种用于偏盲棱镜矫正的新方法，该方法以方便且实用的形式提供视野扩展，并评估其初步临床应用。
为了扩展视野的上象限，在患侧眼镜片上部靠近角膜缘处放置一个高屈光力棱镜片（30 - 40棱镜度），基底向外。在镜片下部使用类似的棱镜片来治疗下视野。棱镜的周边位置会导致周边外斜视。结果，一个与棱镜垂直跨度一样高的场景片段相对于另一只眼睛的视野横向偏移15至20度。在偏盲视野缺损边缘，原本会落在一只眼睛暗点内的物体通过另一只眼睛的棱镜被看到，从而提供了对原本缺失视野内细节的同时感知。还讨论了一种为双眼视觉异常（斜视和弱视，有或无复视）患者适配该系统的方法。在一个非对照病例系列（12例患者）中评估了棱镜的效果。
在任何侧方注视位置，包括注视远离暗点一侧时，均可实现视野扩展。使用标准双眼视野计证明了该技术对视野扩展的效果。大多数患者报告在功能和避开障碍物方面有显著改善。
开发并测试了一种用于偏盲光学治疗的新方法。发现该方法在扩展视野和帮助患者行动方面有效。
