What is another name for a lens button?

A lens button is commonly referred to as a lens blank. This term describes the uncut or unfinished shape of a contact lens, typically made from the same material that will be used in the final lens. Lens blanks serve as the starting point in the manufacturing process, where they are further shaped and polished to meet specific prescription requirements. Understanding the terminology surrounding lens fabrication processes is important for those in the field, as it provides clarity on the components involved in contact lens production.

The other options refer to different concepts within the realm of contact lenses. A lens case center might describe the part of a contact lens case that holds the lens, while a fitting template is a tool used to measure the dimensions needed for proper lens fitting. Lastly, a contact lens cleaning device is used for maintaining lens hygiene but does not relate directly to the lens material itself.