Department of Ophthalmology, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
Yonsei Med J. 2010 Jan;51(1):117-20. doi: 10.3349/ymj.2010.51.1.117. Epub 2009 Dec 29.
To evaluate the effect of acrylic refractive prism and Fresnel membrane prism on stereoacuity in intermittent exotropia.
Stereoacuities of fifty-two patients (mean age, 12.4 years; range 6 to 45 years) with intermittent exotropia were measured using the Titmus and TNO stereotests, while they wore prisms of varying power on nonfixating eye or evenly on each eye.
Stereoacuities were significantly reduced with increasing prism power for both prisms, ranging from 8 to 25 prism dipotres. The effects on stereoacuity in single acrylic prism and single Fresnel prism were similar, whereas spilt Fresnel prisms reduced stereoacuity more than spilt acrylic prisms. Spilt prisms were found to have much less effect on stereoacuity than single prisms for both acrylic and Fresnel prisms.
The use of acrylic refractive prism shared evenly on each eye would be optimal method to minimize the reduction of stereoacuity during the prismatic therapy for intermittent exotropia.
评估丙烯酸折射棱镜和菲涅尔膜棱镜对间歇性外斜视立体视锐度的影响。
使用Titmus 和 TNO 立体视检查仪测量 52 例间歇性外斜视患者（平均年龄 12.4 岁；6 至 45 岁）的立体视锐度，同时在非注视眼或每只眼上佩戴不同屈光度的棱镜。
两种棱镜的立体视锐度均随棱镜度数的增加而显著降低，范围为 8 至 25 棱镜底度。单丙烯酸棱镜和单菲涅尔棱镜的立体视锐度影响相似，而分体式菲涅尔棱镜的立体视锐度降低程度大于分体式丙烯酸棱镜。分体棱镜对丙烯酸和菲涅尔棱镜的立体视锐度的影响均小于单棱镜。
在间歇性外斜视的棱镜治疗中，将丙烯酸折射棱镜平均分配到每只眼上使用，是将立体视锐度降低最小化的最佳方法。
