Optical devices

device or mechanishm for detecting obstruction of a light beam

adaptive optics system and coronagraphic facility at the Very Large Telescope

small disk used in telescopes to block a bright object, to see fainter objects nearby

An optode or optrode is an optical sensor device that optically measures a specific substance usually with the aid of a chemical transducer.

A haploscope is an optical device for presenting one image to one eye and another image to the other eye. The word derives from two Greek roots: haploieides, single and skopeo, to view. The word is often used interchangeably with stereoscope, but it is more general than that. A stereoscope is a type of haploscope, but not vice versa. The word has more currency in the medical field than elsewhere, where it refers to instruments designed to test binocular vision. These instruments include Worth's amblyoscope and the synoptophore.

device that turns visual into digital data