| ocular sparganosis | Infestation of the orbits with the sparganum of Spirometra mansoni; characterised by redness and oedema of the eyelids, lacrimation, and blepharoptosis; acquired by application of infected raw frog flesh against the eye as a poultice. (05 Mar 2000) |
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| ocular tension | Resistance of the tunics of the eye to deformation; it can be estimated digitally or measured by means of a tonometer. (05 Mar 2000) |
| ocular torticollis | Torticollis incident to paralysis of an extraocular muscle, especially an oblique muscle. (05 Mar 2000) |
| ocular vertigo | Dizziness attributed to refractive errors or imbalance of the extrinsic muscles. (05 Mar 2000) |
| ocular vesicle | In the embryo, one of the paired evaginations from the ventrolateral walls of the forebrain from which the sensory and pigment layers of the retina develop. Synonym: vesicula ophthalmica, ocular vesicle, optic vesicle. (05 Mar 2000) |
| onchocerciasis, ocular | Filarial infection of the eyes transmitted from person to person by bites of onchocerca volvulus-infected black flies. The microfilariae of onchocerca are thus deposited beneath the skin. They migrate through various tissues including the eye. Those persons infected have impaired vision and up to 20% are blind. The incidence of eye lesions has been reported to be as high as 30% in central america and parts of africa. (12 Dec 1998) |
| toxoplasmosis, ocular | Infection caused by the protozoan parasite toxoplasma in which there is extensive connective tissue proliferation, the retina surrounding the lesions remains normal, and the ocular media remain clear. Chorioretinitis may be associated with all forms of toxoplasmosis, but is usually a late sequel of congenital toxoplasmosis. The severe ocular lesions in infants may lead to blindness. (12 Dec 1998) |
| tuberculosis, ocular | Tuberculous infection of the eye, primarily the iris, ciliary body, and choroid. (12 Dec 1998) |
| extra-ocular muscle disease | <radiology> Graves disease, pseudotumour, lymphoma, metastasis, infection, carotid-cavernous fistula, granulomatous disease (12 Dec 1998) |
| unit of ocular convergence | The amount of convergence required to view binocularly an object 1 meter distant and exerting 1 diopter of accommodation. Synonym: unit of ocular convergence. (05 Mar 2000) |
| 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) |
| 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) |