• Does Lens Shape Affect Prism Effectiveness?


    Question:

    Can the shape of lenses (rectangular versus oval) undermine the effectiveness of a prism? My new rectangular glasses with prism aren't working properly. It feels like I can't hold my right eye straight at a distance. Previous lenses have always been oval and OK.


    Answer:

    I don't think the shape of the lenses is the problem. However, if the prism is in the wrong axis or direction or not appropriately placed you may have symptoms like these. I would have the glasses checked to make sure they were made correctly; and if so, have the measurements and refraction repeated to verify that the prescription was correct.


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