![]() There are different ways to compensate for this. But when the prism which needs to be verified gets stronger than 6cm/m (or pdpt) the illuminated target gets deviated so much you can’t probably see it on the scale anymore looking inside the lensometer. The mentioned instructions work well with lower prisms. But the person measuring the prism still needs to know where the wearer is looking through the glasses and which lens design is used. With more modern autolensmeters less technical skill is required to measure the prism in ophthalmic lenses.
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