(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.

(physics) a property caused by asymmetrical molecular or crystal structure that enables a compound or crystal to rotate the plane of incident polarized light

(chemistry) Any one of a number of compounds that exhibit optical isomerism.

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

(computing) The electronic identification and digital encoding of printed or handwritten characters by means of an optical scanner and specialized software.

(American spelling) Alternative form of optical fibre

(British spelling) A thin, transparent, flexible fibre, made of glass or plastic, used for transmitting light.