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Reading Prism in Lensometer Guide by Malik Allahbachaya is a document available to read on EtoBox.
What is Reading Prism in Lensometer Guide about?
Prism verification involves using a lensometer to determine the amount and direction of any prism present in an eyeglass lens. The target is deflected in the direction of the prism base, either toward the nose for base-in prism or toward the temples for base-out prism. The amount of deflection is read using the reticle, with each full and half ring representing the strength of the prism in prism diopters. The prism is measured where the middle sphere and cylinder lines cross on the lensometer.
- Author
- Malik Allahbachaya
- Language
- EN