| PPV | pneumococcal polysaccharide vaccine; porcine parvovirus; positive predictive value; positive pressur... |
|---|---|
| PRE | photoreacting enzyme; physician's report of examination; pigmented retinal epithelium; preplacement ... |
| PRF | partial reinforcement; patient report form; perforin; plasma recognition factor; pontine reticular f... |
| prog | progress, progressive |
| PRP | physiologic rest position; pityriasis rubra pilaris; platelet-rich plasma; polyribosyl ribitol phosp... |
| eye diseases, hereditary | Transmission of gene defects or chromosomal aberrations/abnormalities which are expressed in extreme variation in the structure or function of the eye. These may be evident at birth, but may be manifested later with progression of the disorder. (12 Dec 1998) |
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| Leber's hereditary optic atrophy | Hereditary degeneration of the optic nerve and papillomacular bundle with resulting rapid loss of central vision, progressive for several weeks, then usually stationary with permanent central scotoma; age of onset is variable, most often in the third decade; more males than females are affected and transmission is cytoplasmic and strictly on the female side. Mutation on the mitochondrial chromosome involved, which presumably interacts with an X-linked mutant. This mechanism may explain the bizarre sex ratio, which differs significantly from one country to another. (05 Mar 2000) |