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4.渐进镜片的光学特性 4.1 渐进镜片的镜度: 每一片渐变镜片都含有戴镜者从远至近所有的镜度,其镜度分布如图7所示: 镜片的上部,称为远用区域,这一区域具有稳定的镜度。 镜片的下部称为近用区域,能利用这一区域进行近距离工作。 这二个区域的中间有一过渡槽连接。这一过渡槽的镜度是连续变化的。 这一过渡槽的两侧,呈现一定量的像差,见图8所示。 4.2 黄斑凹中心视力:视网膜黄斑凹提供视物的清晰明锐的视力,因此镜片上的某一区域的镜度必须
4. Progressive optical properties of the lens 4.1 Progressive lenses of the mirror: Each piece of the graduated lenses have wearing glasses from far to near all the mirror, the mirror distribution shown in Figure 7: The upper part of the lens, known as the far zone This region has a stable mirror. The lower part of the lens is called the near area, which can be used to work close to the area. There is a transitional trough in the middle of these two areas. The mirror of this transitional groove changes continuously. On both sides of this transitional groove, a certain amount of aberration appears, as shown in Figure 8. 4.2 macular concave central visual acuity: macular retina to provide clear and sharp visual acuity of vision, so the mirror must mirror a certain area