What is the term for the angled edge of a spectacle lens?

The term for the angled edge of a spectacle lens is referred to as a bevel. This beveled edge is an important feature in the design and fitting of lenses, as it helps to provide a smooth transition between the lens and the frame. The bevel allows the lens to fit securely within the frame, improving aesthetics and comfort for the wearer. It also aids in the overall durability of the lens, as it helps reduce stress at the edges during handling and wearing.

In the context of optics, the other terms listed have different meanings. A blocker is typically associated with the process of blocking a lens during surfacing to hold it in place, while a carrier would refer to the main lens material or support structure, and centration relates to the alignment of the optical center of the lens with the pupil of the eye. Understanding these distinctions helps solidify the knowledge of lens construction and fitting techniques.