Lens calipers are commonly used to measure:

Lens calipers are precision tools designed specifically for measuring the thickness of lenses. This function is crucial in ophthalmic dispensing, as the thickness of a lens can affect its optical performance, weight, and overall aesthetics. When fitting eyewear, ensuring the correct lens thickness is essential for the proper alignment within the frame and for maintaining the desired optical properties, such as strength and clarity.

While lens calipers can measure other dimensions, such as lens diameter and bifocal height, their primary and most accurate function is in measuring thickness. The index of refraction, which is a property of the lens material itself, is not something that can be directly measured with calipers; it is typically determined through other methods or referenced from material specifications. Therefore, the ability of lens calipers to provide precise measurements of lens thickness underlines their importance in ensuring high-quality lens fabrication and fitting in ophthalmic practice.