ophthalmology Flashcards
risk factors for vitreous haemorrhage
diabetes
anticoagulants
bleeding disorders
presentation of vitreous haemorrhage
painless sudden loss of vision
dark spots in vision may also occur
red hue in vision
absent red reflex
features of acute angle closure glaucoma
severe pain decreased visual acuity symptoms worse with mydriasis haloes around lights semi-dilated non-reacting pupils hazy cornea systemic upset
features of optic neuritis
CRAP: Central scotoma RAPD Acuity deteriorates over hrs/days Pain on movement
treatment for herpes simplex keratitis
topical aciclovir
features of central retinal vein occlusion
sudden painless loss of vision
severe retinal haemorrhages on fundoscopy
features of central retinal artery occlusion
sudden painless loss of vision (‘descending curtain’)
RAPD
pale retina with cherry-red spot on fundoscopy
how is the site of the lesion identified in Horner’s syndrome
location of anhydrosis
head, arm and trunk = central lesion such as stroke
just face = pre-ganglionic lesion, e.g. Pancoast’s
no anhydrosis = post-ganglionic lesion, e.g. carotid dissection
mx of acute angle closure glaucoma
IV acetazolamide + combination of eye drops
e.g. Pilocarpine (direct parasympathomimetic), Timolol (beta-blocker), Apraclonidine (alpha-2 agnoist)
causes of cataracts
normal ageing hypocalcaemia diabetes long-term steroid use smoking
risk factors for primary open angle glaucoma
genetics black patients myopia HTN diabetes corticosteroids
moa of beta blockers in primary open-angle glaucoma
reduce aqueous production
moa of prostaglandin analogues in primary open-angle glaucoma
increase aqueous outflow
moa of sympathomimetics in primary open-angle glaucoma
reduce aqueous secretion and increase aqueous outflow
mydriasis
pupillary dilatation
miosis
pupillary constriction