Okaps flashcards - glaucoma

Question 1

Name 2 RGC cells

Answer 1

M cells: large diameter axons, dim light. P cells: small diameter axons, color and fine detail

Question 2

Blood flow to four layers of optic nerve

Answer 2

NFL: CRA, prelaminar: sort posterior, laminar: posteiror ciliary, retrolaminar: branches of meningeal and CRA

Question 3

composition of vitreous

Answer 3

99% protein free, very high vit C, calcium is half of plasma, lactate in aquous is higher

Question 4

where in the TM is resistance the greatest?

Answer 4

juxtracanalicular meshwork

Question 5

cause of ACG in pt who underwent scleral buckle

Answer 5

anterior rotation of ciliary body

Question 6

what drug when added to betaxol procduce and ocular hypotensive effect equivalent to timolol

Answer 6

dipivefrin

Question 7

function of longitudinal and circular fibers

Answer 7

long: insert into scleral spur, affect outflow, circular: affect acomodation.

Question 8

helmotz theory of accomodation

Answer 8

contraction of long pulls lens forward, shallowing AC. Contraction of circular relaes zonules, lens more spherical, more focusing power. Relaxation of circular fibers tightens zonules, streches lens, makes I tthinner

Question 9

production of aqueous

Answer 9

by active secretion, Na/K pump and carbonic anhydrase

Question 10

how to measure aquous humor

Answer 10

fluorophotometry, AC volume 250 ul, PC 60 ul

Question 11

compositionof aquous

Answer 11

acidic 7.2, 15x more ascorbate, low protein, lower CA, phos, otherwise similar

Question 12

outflow pathway

Answer 12

uveoscleral meshwork, corneal scleral, juxtacnalicular, schlemms collector channels, veins, SOV, cavernous inus

Question 13

effect of cycloplegics on uvealscleral outflow

Answer 13

increases

Question 14

ddx of blood in sclem’s cnal

Answer 14

elevated episcleral venous pressure, nevus of ota, NF, congenital ectropion uvae

Question 15

IOP changes with

Answer 15

higer lying down than siting, lower after exercise.

Question 16

extent of visual field

Answer 16

60 nasally, 75 omferopr; 100 temporally

Question 17

goldman test size

Answer 17

I-V each increment doubles diameter, quadroulds area

Question 18

goldman light filter

Answer 18

1-4 incrememnts to 5 db, a-e 1 db.

Question 19

chromosome of pigmentary glaucoma

Answer 19

15

Question 20

krunkenberg’s spindle

Answer 20

melanin phagocytized by corneal endothelium

Question 21

causes of elevated episcleral venous pressure

Answer 21

CCF, sturge weber, NF, orbital mass, TED

Question 23

plateau iris

Answer 23

deep central AC, shallow peripheral

Question 24

mechanism of malignant glaucoma

Answer 24

entire AC shallow, has PI

Question 25

RF for aqeuous misdirection

Answer 25

uveitis, angle closure, nanophthalmis, post op

Question 26

rx for malignant glaucoma

Answer 26

cycloplegia, pulls lens iris diaphragm posteriorly, aqueous suppressents.

Question 27

mechanism of MMC

Answer 27

intercaltes with DNA 100x more potent thant 5FU

Question 28

mechanism of 5FU

Answer 28

affects S phase,