Downing J E, Sayano R R
J Am Intraocul Implant Soc. 1983 Summer;9(3):297-300. doi: 10.1016/s0146-2776(83)80059-7.
Posterior chamber lenses were inserted with the plano surface anterior because of theoretical optical improvements in spherical and chromatic aberration, less induced magnification, and a reported decrease in late opacification of the posterior capsule. A decrease in effective lens power occurred, with a shift in observed refraction of approximately + 1.50 diopters (D) from that calculated. This finding is explained by the location of the principal planes of a plano-convex lens. Orienting the plano surface anteriorly causes an observed increase in required anterior chamber depth (ACD) calculation that averages 1.1 mm. Required ACD using the Binkhorst formula was 5.1 mm; the Sanders-Retzlaff-Kraff (SRK) A constant required was 118.7. The need for secondary capsulotomy has been only 5.8% with an average follow-up of 19 months and a range of 12-27 months.
后房型人工晶状体植入时将平面朝前，这是因为理论上其在球差和色差方面有光学改善、诱导放大率较小，且有报道称后囊膜晚期混浊减少。有效晶状体屈光力降低，观察到的屈光变化与计算值相比约有 + 1.50 屈光度（D）的偏移。这一发现可通过平凸透镜主平面的位置来解释。将平面朝前会使观察到的所需前房深度（ACD）计算值增加，平均增加 1.1 毫米。使用 Binkhorst 公式计算所需的 ACD 为 5.1 毫米；所需的 Sanders-Retzlaff-Kraff（SRK）A 常数为 118.7。平均随访 19 个月（范围为 12 - 27 个月），二次囊切开术的需求仅为 5.8%。
