According to ANSI, what is the standard measurement for seg heights?

The standard measurement for segment heights according to ANSI (American National Standards Institute) is indeed set as 1mm. This measurement is crucial because it defines the height at which the segment of a bifocal or multifocal lens is positioned above the bottom of the lens, ensuring that the optical properties are aligned correctly for the wearer. Segment height is particularly important for the visual comfort and effectiveness of the lens, as it impacts how a wearer transitions between different portions of the lens for various viewing distances.

In the context of lens fitting, accurate measurement of segment heights allows for precise customization of the eyewear, leading to optimal visual performance. Failing to adhere to this standard may result in discomfort or poor vision quality for the user, highlighting the importance of this measurement in optician practices.

This understanding underlines the significance of following ANSI standards in the production and fitting of optical products, ensuring that patients receive eyewear tailored to their specific needs.