Hi secrettheatre.
Diabetic Maculopathy.
This condition is more common in older, non-insulin dependent diabetics, and is the most common cause of gradual loss of vision in a patient with non-proliferative diabetic retinopathy.
This involves
the breakdown of the bloodretinal barrier
leakage of plasma from small blood vessels in the macula
swelling of the central retina
formation of hard exudates
diabetic macular oedema
does not cause total blindness o leads to severe loss of central vision (1)
clinically significant macular oedema is
retinal thickening and/or
adjacent hard exudates that either involve the center of the macula
Four types of diabetic maculopathy are recognised:
cystoid:
characterised by microaneurysms and haemorrhages but relatively few, if any, hard exudates
the main feature is extensive macular oedema which if persistent, may lead to a lamellar hole at the fovea with permanent impairment of visual acuity
focal - a background diabetic retinopathy, associated with macular oedema and surrounding hard exudates
ischaemic - similar ophthalmic picture to cystoid and differentiated from it by fluorescein angiography
mixed - exudates, oedema and ischaemia
Reference:
Frank RN. Diabetic Retinopathy.N Engl J Med 2004;350:48.
Here is a link to a website which explains in more detail:
http://medweb.bham.ac.uk/easdec/diabeti ... pathy.html