| background retinopathy | <ophthalmology, pathology> Early stage of diabetic retinopathy, it usually does not impair vision. Origin: Gr. Pathos = disease (09 Oct 1997) |
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| background level | The average amount of a substance present in the environment. Originally referring to naturally occurring phenomena. Used in toxic substance monitoring. (05 Dec 1998) |
| background radiation | <radiobiology> Level of environmental radation due to background sources. Background sources can be natural, such as cosmic rays and natural radioactive elements (principally radon, but including other elements such as isotopes of potassium (which people get substantial amounts of in foods like bananas)). They can also be man-made, such as from fossil-fuel combustion, everyday leakage from nuclear activities, and leftover from atmospheric nuclear weapons tests. Background radiation is usually distinguished from acute radiation, such as from medical X-rays, nuclear accidents, radioisotope therapy, or other short-term doses. The man-made contribution to background radiation is quite small compared to the natural contribution, medical uses dominate human exposure to acute radiation. (09 Oct 1997) |
| body temperature changes | Any deviation from normal body temperature of the human body, about 98.6 degrees f. Or 37 degrees c. When taken orally. (12 Dec 1998) |
| postmortem changes | Changes that occur in bodies after death. (12 Dec 1998) |
| trophic changes | Abnormalities of the skin, hair, nails, subcutaneous tissues and bone, caused by peripheral nerve lesions. Synonym: neuritic atrophy, neurogenic atrophy, neurotrophic atrophy, trophic changes. (05 Mar 2000) |
| arteriosclerotic retinopathy | Retinopathy distinguished by attenuated retinal arterioles with increased tortuosity, copper-or silver-wire appearance, perivascular sheathing, irregularity of lumen and scattered small haemorrhages, and small, sharp-edged deposits without surrounding oedema. (05 Mar 2000) |
| macular retinopathy | Any pathological condition of the macula lutea. Synonym: macular retinopathy. (05 Mar 2000) |
| venous-stasis retinopathy | A uniocular retinopathy associated with occlusion of the central retinal vein; a nonischemic central retinal vein occlusion. (05 Mar 2000) |
| renal retinopathy | Hypertensive retinopathy associated with chronic glomerulonephritis or nephrosclerosis. (05 Mar 2000) |
| central angiospastic retinopathy | Detachment of the sensory retina induced by decreased adhesion between cells of the retinal pigment epithelium which permits plasma from the choriocapillaris to enter subretinal space. Synonym: central angiospastic retinopathy, central serous retinopathy. (05 Mar 2000) |
| central serous retinopathy | Detachment of the sensory retina induced by decreased adhesion between cells of the retinal pigment epithelium which permits plasma from the choriocapillaris to enter subretinal space. Synonym: central angiospastic retinopathy, central serous retinopathy. (05 Mar 2000) |
| retinopathy | 1. <ophthalmology> Retinitis: inflammation of the retina. 2. <disease> Retinosis: degenerative, noninflammatory condition of the retina. Origin: Gr. Pathos = disease (18 Nov 1997) |
| retinopathy of prematurity | <ophthalmology, paediatrics> A bilateral retinopathy occurring in premature infants treated with excessively high concentrations of oxygen, characterised by vascular dilatation, proliferation, and tortuosity, oedema, and retinal detachment, with ultimate conversion of the retina into a fibrous mass that can be seen as a dense retrolental membrane. Usually growth of the eye is arrested and may result in microophthalmia, and blindness may occur. (03 Jul 1999) |
| retinopathy punctata albescens | A disease in which both fundi show numerous white dots through the retina; causes night blindness. (05 Mar 2000) |