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眼镜镜片屈光度的测量一般都用镜片测度表或镜片测度仅。但一般医院眼科多没有上述两项器械。现介绍透镜的一种简易测量方法。 材料:镜片箱1只,视力表1只。 步骤:1.判定眼镜片是球面透镜抑或柱镜。 以5m远的一个十字线为目标(如视力表一直角两边)。把未知透镜置於眼前33mm处旋转观察两直角边有无出现剪动,若无剪动,说明该透镜是球面透镜;若有,则含有柱镜成分。 2.定心——光学中心的确定。 对球面透镜,缓慢上下左右移动,使两直角边透过透镜成的像和两直角边相垂叠时,此时直角顶点即是
Spectacles lens refraction measurements are generally measured with lenses or lenses only measure. However, the general hospital ophthalmology more than the two devices. Now introduce a simple lens measurement method. Material: 1 lens box, 1 eye chart. Steps: 1. To determine whether the lens is spherical lens or cylinder. To a cross 5m away as the goal (such as the eye chart on both sides of the right angle). The unknown lens is placed in front of the eye rotation 33mm at both sides of the existence of any right-angle shear, if not cut, indicating that the lens is a spherical lens; if so, it contains the cylinder components. 2. Centering - the optical center to determine. Right spherical lens, slowly move up and down, so that the two right-angle side through the lens into the image and the two right-angle edge of the vertical when the vertex is right