Pupil alignment arrangement for aligning the pupil middle with a spectacle lens so that the lens is correctly positioned in spectacle frames, comprises a target and pin hole shutter

摘要

Arrangement for locating the pupil middle of a human eye (15) comprises an indicator (10) with at least a shutter (13) with an opening (14) and a target marking (12). The opening is placed in the region of the focal point (20) of the eye and is small relative to pupil (22) diameter. Images (16', 12') of the edge (16) of the pupil and the target marking are formed on the retina (17) so that the images can be centered relative to each other.