| ophthalmoscopy | <procedure> Observation of the optic disc, retina and blood vessels. May be examined by direct or indirect ophthalmoscopy. In direct ophthalmoscopy the examiner uses an ophthalmoscope the size of a flashlight to shine a beam of light into your eye. In indirect ophthalmoscopy a head lamp device is used and a much brighter light. Visualisation of the retina is important in conditions such as glaucoma, diabetes, hypertension and conditions that cause increased intracranial pressure. (27 Sep 1997) |
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| ophthalmoscopy with reflected light | Examination of that part of the fundus adjacent to an area illuminated by a sharply focused light. (05 Mar 2000) |
| ophthalmotrope | A model of the two eyes, to each of which are attached weighted cords pulling in the direction of the six extrinsic eye muscles; used to demonstrate the action of the ocular muscles singly or in various combinations. Origin: ophthalmo-+ G. Tropos, a turning (05 Mar 2000) |
| ophthalmovascular | Relating to the blood vessels of the eye. (05 Mar 2000) |
| ophthalmy | Same as Ophthalmia. Source: Websters Dictionary (01 Mar 1998) |
| opianic | <chemistry> Of, pertaining to, or designating, an organic acid obtained by the oxidation of narcotine. Origin: From Opium. Source: Websters Dictionary (01 Mar 1998) |
| opianine | <chemistry> An alkaloid found in small quantity in opium. It is identical with narcotine. Source: Websters Dictionary (01 Mar 1998) |
| opianyl | <chemistry> Same as Meconin. Origin: Opianic + -yl. Source: Websters Dictionary (01 Mar 1998) |
| opiate | <pharmacology> A remedy containing or derived from opium, also any drug that induces sleep. Naturally occuring basic (alkaloid) molecules with a complex fused ring structure. Have high pharmacological activity. See: morphine. (18 Nov 1997) |
| opiate receptor | <pharmacology> Opiate-binding sites found throughout primary afferents and the neuraxis. (16 Dec 1997) |
| opiate receptors | Regions of the brain which have the capacity to bind morphine; some, along the aqueduct of Sylvius and in the centre median, are in areas related to pain, but others, as in the striatum, are not related. (05 Mar 2000) |
| opine | <molecular biology> Compound produced by plant cells containing T DNA: induce transfer genes on Ti plasmids. (18 Nov 1997) |
| opioid | Originally, a term denoting synthetic narcotics resembling opiates but increasingly used to refer to both opiates and synthetic narcotics. (05 Mar 2000) |
| opioid agonist | <pharmacology> Any morphine-like compound that produces bodily effects including pain relief, sedation, constipation and respiratory depression. (16 Dec 1997) |
| opioid antagonists | Agents such as naloxone and naltrexone which have high affinity for opiate receptors but do not activate these receptors. These drugs block the effects of exogenously administered opioids such as morphine, heroin, meperidine, and methadone, or of endogenously released endorphins and enkephalins. (05 Mar 2000) |