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Flashcards in Okaps flashcards - glaucoma Deck (27):
1

Name 2 RGC cells

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

2

Blood flow to four layers of optic nerve

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

3

composition of vitreous

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

4

where in the TM is resistance the greatest?

juxtracanalicular meshwork

5

cause of ACG in pt who underwent scleral buckle

anterior rotation of ciliary body

6

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

dipivefrin

7

function of longitudinal and circular fibers

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

8

helmotz theory of accomodation

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

9

production of aqueous

by active secretion, Na/K pump and carbonic anhydrase

10

how to measure aquous humor

fluorophotometry, AC volume 250 ul, PC 60 ul

11

compositionof aquous

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

12

outflow pathway

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

13

effect of cycloplegics on uvealscleral outflow

increases

14

ddx of blood in sclem's cnal

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

15

IOP changes with

higer lying down than siting, lower after exercise.

16

extent of visual field

60 nasally, 75 omferopr; 100 temporally

17

goldman test size

I-V each increment doubles diameter, quadroulds area

18

goldman light filter

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

19

chromosome of pigmentary glaucoma

15

20

krunkenberg's spindle

melanin phagocytized by corneal endothelium

21

causes of elevated episcleral venous pressure

CCF, sturge weber, NF, orbital mass, TED

23

plateau iris

deep central AC, shallow peripheral

24

mechanism of malignant glaucoma

entire AC shallow, has PI

25

RF for aqeuous misdirection

uveitis, angle closure, nanophthalmis, post op

26

rx for malignant glaucoma

cycloplegia, pulls lens iris diaphragm posteriorly, aqueous suppressents.

27

mechanism of MMC

intercaltes with DNA 100x more potent thant 5FU

28

mechanism of 5FU

affects S phase,