| opto- | Optico- Optical; optic; ocular. Origin: G. Optikos, optical, from ops, eye (05 Mar 2000) |
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| optocoelia | <anatomy> The cavity of one of the optic lobes of the brain in many animals. Origin: NL. Optocoelia, fr. Gr. Optic + a hollow. Source: Websters Dictionary (01 Mar 1998) |
| optogram | <physiology> An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See Optography. Origin: Optic + -gram: cf. F. Optogramme. Source: Websters Dictionary (01 Mar 1998) |
| optography | <physiology> The production of an optogram on the retina by the photochemical action of light on the visual purple; the fixation of an image in the eye. The object so photographed shows white on a purple or red background. See Visual purple, under Visual. Origin: Optic. Source: Websters Dictionary (01 Mar 1998) |
| optokinetic | See: optokinetic nystagmus. Origin: opto-+ G. Kinesis, movement (05 Mar 2000) |
| optokinetic nystagmus | Nystagmus induced by looking at moving visual stimuli. Synonym: opticokinetic nystagmus, railroad nystagmus. (05 Mar 2000) |
| optomeninx | Synonym: retina. Origin: opto-+ G. Meninx, membrane (05 Mar 2000) |
| optometer | <physiology> An instrument for measuring the distance of distinct vision, mainly for the selection of eveglasses. Origin: Optic. Source: Websters Dictionary (01 Mar 1998) |
| optometrist | Professional trained to provide primary eye and vision care and improve vision with glasses, contact lenses, etc. An optometrist is an o.d. (doctor of optometry), not an m.d. (12 Dec 1998) |
| optometry | The professional practice of primary eye and vision care that includes the measurement of visual refractive power and the correction of visual defects with lenses or glasses. (12 Dec 1998) |
| optomyometer | An instrument for determining the relative power of the extrinsic muscles of the eye. Origin: opto-+ G. Mys, muscle, + metron, measure (05 Mar 2000) |
| optotypes | Test letters. See: test types. Origin: opto-+ G. Typos, type (05 Mar 2000) |