Lens

Question 1

diameter and AP thickness of adult lens

Answer 1

9-10 mm

5 mm

Question 2

type of collagen in lens capsule

Answer 2

type IV collagen

Question 3

where is lens capsule thinnest?

Answer 3

posteriorly

Question 4

what is the equatorial lens bow?

Answer 4

region of lens epithelium at equator where epithelial cells elongate into lens fibrs

Question 5

oil droplet red reflex?

Answer 5

lentiglobus or lenticonus

Question 6

b/l anterior lenticonus with anterior polar cataract, hemorrhagic nephritis, deafness, retinal neovasc.

Answer 6

Alport syndrome

Question 7

features of oculocerebral syndrome of Lowe

Answer 7

X-linked. systemic acidosis, renal rickets, hypotonia, congenital cataracts, and posterior lenticonus

Question 8

endophthalmitis following a YAG cap?

Answer 8

P acnes (release of sequestered organisms that entered during CE IOL. infection usually 2 months to 2 years post-phaco)

Question 9

focal areas of necrotic lens epithelial cells after acute rise in IOP?

Answer 9

glaukomflecken

Question 10

Risk factors for PSC?

Answer 10

chronic inflammation, steroids, smoking, DM, radiation

Question 11

Pathophysiology of PSC?

Answer 11

posterior migration of lens epithelial cells, which then swell 5-6 x normal size (bladder cells of Wedl)

Question 12

Pathophysiology of PCO?

Answer 12

remaining epithelial cells proliferate and cover the inner surface of the posterior lens capsule

Question 13

Pathophysiology of Soemmering ring?

Answer 13

sequestration of proliferating lens fibers at the equator as a result of incomplete cortical removal during cataract surgery

Question 14

accumulation of eosinophilic globules in slitlike spaces between lens fibers

Answer 14

morgagnian globules (sign of cortical degeneration)

Question 15

freely floating nucleus in liquefied cortex and shrunken capsule?

Answer 15

morgagnian cataract