OAD stands for which term in lens measurements?

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Multiple Choice

OAD stands for which term in lens measurements?

Explanation:
In lens measurements, the key width is the distance across the lens from edge to edge when it sits on the eye—the Overall Diameter. This is the standard term used in lens specifications, and the acronym OAD directly corresponds to it. Knowing the overall diameter helps predict how well the lens will cover the cornea and interact with the eyelids during blinking, which in turn affects centration, movement, and comfort. The other phrases aren’t used to describe this measurement in practice, so they don’t fit as common terms for OAD.

In lens measurements, the key width is the distance across the lens from edge to edge when it sits on the eye—the Overall Diameter. This is the standard term used in lens specifications, and the acronym OAD directly corresponds to it. Knowing the overall diameter helps predict how well the lens will cover the cornea and interact with the eyelids during blinking, which in turn affects centration, movement, and comfort. The other phrases aren’t used to describe this measurement in practice, so they don’t fit as common terms for OAD.

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