1.08 iris pupil and vitreous

Question 1

what are the layers of the iris

Answer 1

anterior border layer
stroma with iris vessels and iris sphincter muscles
anterior epithelium
posterior pigmented epithelium

Question 2

what is the diameter and thickness of a lens

Answer 2

Diameter 9mm
thickness 4mm

Question 3

layers of the lens

Answer 3

external capsule
anterior epithelium
equator
zonule
formation of lens fibres
cortex - young lens fibres
nucleus - old lens fibres

Question 4

what is the uvea

Answer 4

the middle tunic of the eye
split into 3 regions - iris, ciliary body and choroid

Question 5

what are the 3 zones of the iris

Answer 5

pupillary zone
ciliary zone
collarette

Question 6

iris contains what two smooth muscles

Answer 6

sphincter for pupil constriction
dilator for pupil dilation