American Board of Opticianry (ABO) Practice Test 2026 - Free ABO Practice Questions and Study Guide

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What does the acronym BUMM stand for as per the text?

Base up most minus

In opticianry, the acronym BUMM stands for "Base up most minus." This term refers to the position of a lens when the lens is orientated in a position where the base (thicker part) is facing up and the power of the lens is minus. Understanding this acronym is crucial for opticians when working with various lens prescriptions and understanding how lenses should be positioned in eyeglass frames.

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Base under most minus

Base up most median

Base under most median

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