Sclera

Question 1

range of thickness of normal sclera

Answer 1

0.3 mm behind rectus insertions to 1 mm posteriorly

Question 2

primary macromolecule in sclera?

Answer 2

type I collagen

Question 3

What do the inner and outer portions of the sclera merge with posteriorly?

Answer 3

inner: lamina cribrosa
outer: dura

Question 4

where are slcero-uveal attachment strongest?

Answer 4

along major emissary channels, at anterior base of ciliary body, and juxtapapillary

Question 5

what are the characteristics of nonophthalmos

Answer 5

short axial length (15-20 mm), normal or slightly enlarged lens, thickened sclera, predisposition for uveal effusions and glaucoma. usually bilateral

Question 6

histologic difference between simple and nodular episcleritis?

Answer 6

nodular has granulomatous inflammation with central core of necrotic collagen (also, usually in females and associated with systemic conditions like RA)

Question 7

histologic difference between necrotizing and non-necrotizing scleritis?

Answer 7

necrotizing has granulomatous inflammation with central necrotic collagen core. non-necrotizing has perivascular lymphocytic infiltrate without granulomatous inflammation

Question 8

flat, firm, sharply circumscribed, 1 cm ovoid patch just anterior to insertion of rectus muscles appearing bilaterally in elderly population?

Answer 8

senile calcific plaque