American Board of Opticianry (ABO) Practice Test

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Which formula is used to calculate prismatic effect according to the text?

Power times 0.5
Measures vertex distance
Characteristic of a minus lens
The limbus is in conjunction with the cornea and sclera

The correct answer is: Power times 0.5

The correct formula for calculating prismatic effect according to the text is Power times 0.5. This calculation takes into account the power of the lens and the distance at which the lens is placed from the eye. Option B, measuring vertex distance, is not a formula and only determines the distance between the eye and the lens. Option C, characteristic of a minus lens, is too vague and does not provide a specific formula. Option D, involving the limbus, is not relevant to prismatic effect as it refers to the border between the cornea and sclera. Therefore, the option A is the only accurate formula for calculating prismatic effect.