Certified Ophthalmic Assistant Practice Exam

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The area between the two coeval points of a spherocylindrical lens is called the conoid of

  1. focus

  2. curvature

  3. sturm

  4. refraction

The correct answer is: sturm

The area between the two coeval points of a spherocylindrical lens is called the conoid of Sturm. In optics, the conoid of Sturm refers to the surface generated by the intersection of a spherocylindrical lens and a plane that parallels the lens's optic axis. This term is specifically used to describe the zone where all light rays passing through the lens converge to a single point after refraction. Therefore, the correct answer is C.

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