Led projector for projecting distance tests, aimed at recognition of sight.

摘要

The projector displays reference figures, of which there are a number on a support movable in stages by a remote control. The latter is in the form of a conventional keyboard, operating by simple contact. There can be one key for each reference figure, marked with the figure concerned, and the one belonging to a projected figure can emit a light signal. The keyboard can also include keys controlling the placement of filters in the path of the light beam, rotation of a prism etc. The design combines compactness with reliability and light weight as compared with conventional designs.