(neuropathology) An autoimmune disease with a similar presentation to multiple sclerosis, but is common in Asians and in most cases is characterised by the presence of anti-aquaporin 4 antibodies.

Of, or relating to sight; visual. / Designed to assist or enhance sight / Of, or relating to optics. / Of, or relating to visible light. / Incorporating light-sensitive devices.

(film) Any special effect requiring laboratory work on the film.

An image that is visually deceptive or misleading.

Op art.

A photonic device that integrates multiple information signals which are composed of light of various wavelengths.

(telecommunications) A switch that can selectively change signals between optical fibers or integrated optical circuits.

plural of optical illusion

(physics) The differential Raman scattering of left and right circularly polarized light by chiral molecules.

(chemistry, of a crystal or compound) Exhibiting optical activity.