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What is the name of the point of a prism?

  1. sph/cylindrical

  2. Prism

  3. Effective diameter

  4. Apex

The correct answer is: Apex

The correct answer is D. Apex. The apex of a prism refers to the point at which the two sloping surfaces meet. It is the point that is furthest from the base of the prism. Understanding the term "apex" is important in optometry as it helps in correctly identifying and describing different aspects of prism lenses. Options A, B, and C are incorrect: A. Sph/cylindrical are terms related to the type of lens designations for spherical and cylindrical prescriptions, not specific to prisms. B. Prism is a general term for the optical element itself; in this context, the question is asking for a specific point of the prism. C. Effective diameter refers to the width of a lens or an optical element, not specifically related to the point of a prism.