The longest horizontal length of a single lens is called which measurement?

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Prepare for the Ophthalmic Optics Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

The longest horizontal length of a single lens is called which measurement?

Explanation:
The thing being measured is the width of one lens—the horizontal span from edge to edge. In eyewear terminology this is called the A measurement. It’s the formal label for the lens width, the widest horizontal dimension of a single lens. While people might refer to it as the “eye size” in consumer terms, the standard exam term is A measurement. The other options refer to different things (for example, the distance between lenses or the vertical height of the lens), so they don’t describe the widest horizontal lens dimension.

The thing being measured is the width of one lens—the horizontal span from edge to edge. In eyewear terminology this is called the A measurement. It’s the formal label for the lens width, the widest horizontal dimension of a single lens. While people might refer to it as the “eye size” in consumer terms, the standard exam term is A measurement. The other options refer to different things (for example, the distance between lenses or the vertical height of the lens), so they don’t describe the widest horizontal lens dimension.

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