Ch 2 (Sclera Anat, Routes Of Drug Admin)

Question 1

Thickest part of sclera?

Answer 1

Around the optic nerve

Question 2

Thinnest part of sclera?

Answer 2

Posterior to insertion of recti muscle

Question 3

What are the layers of sclera?

Answer 3

Episclera(reddish hue; no tenderness)
Sclera proper
Lamina fusca

Question 4

What is vaso constrictor test in episcleritis?

Answer 4

On using 2.5% phenylephrine, reddness disappears k/a blanching.
No associated tenderness

Question 5

What is scleritis?

Answer 5

Commonly associated with systemic diseases like RA.
No blanching
Tenderness present

Question 6

What are the openings present in sclera?

Answer 6

@Lamina cribrosa (sieve-like str for allowing optic nerve fibres to pass)
@For vortex veins
@For ant ciliary artery, veins and nerves.

Question 7

What is the location of pleuripotent cells of eye?

Answer 7

Palisades of Vogt at limbus.

Specific marker for limbal stem cells- ABCG2

Question 8

Universal marker of stem cells?

Answer 8

CD34

Question 9

Routes of ocular drug administration?

Answer 9

Subconjunctival
Parabulbar
Topical
Intra vitreal
Intra cameral
Peri bulbar
Retro bulbar

Question 10

What is Nozil technique?

Answer 10

Intra ocular injection in subtenon space via parabulbar route is given by Nozik technique.

Question 11

What is intra cameral injection?

Answer 11

Inj in anterior chamber, used in Sx.

Question 12

State T/F-

Peri bulbar injection is given in extra conal space, while retro bulbar injection is given in Intra conal space.

Answer 12

True