Henningsen M A, Guyton D L
Ophthalmology. 1985 Jun;92(6):831-3.
Teaching subjective refraction techniques ("refractometry") is enhanced by having the student experience the effect of each lens change "through the eyes of the patient." A projector, positioned behind the phoropter, projects a visual acuity chart through the phoropter onto the far wall. "Unknown" refractive errors are simulated by attaching trial lenses to the lens barrel of the projector, and the student progressively clears the projected image as he learns the standard steps of subjective refractometry. The focus sensitivity of each lens change can be varied, if desired, by stopping down the projection system. This simulation, which uses equipment readily available in most ophthalmology offices, has proven useful for both demonstration and practice.
通过让学生“从患者的视角”体验每个镜片变化的效果，可以增强主观验光技术（“验光”）的教学。一台投影仪放置在综合验光仪后方，通过综合验光仪将视力表投射到远处的墙上。通过在投影仪的镜筒上安装试验镜片来模拟“未知”屈光不正，学生在学习主观验光的标准步骤时逐步使投射的图像清晰。如果需要，可以通过缩小投影系统的孔径来改变每个镜片变化的焦点敏感度。这种模拟使用的设备在大多数眼科诊所都很容易获得，已被证明对演示和实践都很有用。
