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PRISM RX FLAT TOPS When a flat top bifocal lens Rx is ordered with prescribed prism... (flat top bifocal or a progressive for that matter), the amount of prescribed prism is placed in front of the pupil, in line with the visual axis. The optical center (OC) is moved to create the correct amount of prism for the way in which the patient should wear their lenses. The fitting height of the s..
THE 1,2, 3 OF PRISM Here's some basics about prism in lenses 1. Eyewear with prism, means that the optical centers of the lenses do not occur at the PD. For example, if the left eye has 2 prism diopters Base Out prescribed, the point on the lens that is 2 Base Out is located at the PD. 2. As a result, in eyewear where there is prescribed prism, we find the pr..
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