Abstract
The accuracy of 26 aged and three new lens measures was investigated. Instruments were applied to surfaces of known curvature employing the conventional, hand-held method as well as while rigged on an optical bench. In addition, using the latter method, a controlled amount of surface tilt was introduced. A large inter-instrument variation in accuracy was encountered. In general, hand-held lens measures were found to provide equally accurate measurements on convex and concave surfaces, with the exception of the −20 D surface, and inclinations from 0° to 5° did not result in erroneous measurements. Results for inclinations of 15° became unreliable. The different usages of the instrument are discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.