| OPG | ocular pneumoplethysmography; orthopantomogram; oxypolygelatin |
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| OT | objective test; oblique talus; occlusion time; occupational therapist, occupational therapy; ocular ... |
| POHS | presumed ocular histoplasmosis syndrome |
| SHORT, S-H-O-R-T | short stature, hyperextensibility of joints or hernia or both, ocular depression, Rieger anomaly, te... |
| VOR | vestibulo-ocular reflex; volume of regret |
| filar micrometre ocular | <microscopy> A micrometre ocular with crossed lines which can be simultaneously focused in and moved across the field by means of a micrometre screw. The amount of displacement can be read in 0.01 steps on the micrometre drum head. This makes a very delicate measuring device, since calibration of the micrometre scale by means of a stage micrometre gives values for each interval on the drum head which are much less than the resolving power of the highest-aperture objectives. (05 Aug 1998) |
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| fixational ocular movement | Rotation of the eyes during voluntary fixation on an object; tremors, flicks, and drifts occur. (05 Mar 2000) |
| fixation, ocular | The direction of the gaze so that the visual image of the object falls on the fovea centralis of the retina, the area of the most acute vision. (12 Dec 1998) |
| Frenkel's anterior ocular traumatic syndrome | <syndrome> An obsolete term for traumatic iridoplegia, which consists of mydriasis, hyphema, small iris tears near the pupil, discrete punctate opacities of the lens, and occasionally iridodialysis. (05 Mar 2000) |