HTHSCI 2F03 Study Guide - Quiz Guide: Scotoma, Ectropion, Diclofenac
26 Dec 2020
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30% of >75yrs will have dry amd. Aberrant vessels grow into retina from choroid and haemorrhage. Rapid visual decline (sudden / days / wks) c distortion. Gives high resolution images of the retina. Antioxidant vitamins (c,e) + zinc may help early armd. Due to toxic effects of cyanide radicals when combined with thiamine deficiency. Pres: optic atrophy, loss of red/green discrimination, scotomata. Depends on susceptibility of pt"s. retina and optic nerve to iop damage. Iop >21mmhg blood flow and damage to optic nerve optic disc atrophy (pale) + cupping. Peripheral visual field defect: superior nasal first. Central field is intact acuity maintained until late. Presentation delayed until optic n. damage is irreversible. Surgery (trabeculectomy) is used if drugs fail. New channel allows aqueous to flow into conjunctival bleb. Dm is leading cause of blindness up to 60yrs. Lens absorbs glucose which is converted to sorbitol by. Hard exudates w/i one disc width of macula.
