The Eye Flashcards
Basal corneal epithelial cells are anchored to Bowman layer by?
Hemidesmosomes
Limbus houses _____ ____ ___ and _______ which link schlemm canal to aqueous veins
corneal stem cells
collector channels
The sclera is vascualr or avascular?
Avascular
What overlies the sclera
Episclera - 2 vascular layesr deep and superficial
The retina has dual circulation - what is it
Inner retina by reintal vessles
Outer retina by choroid
Radius of cornea
8mm
Radium of sclera
12mm
Which is greater in the globe? the equatorial or polar radius
equatorial
What is the anteroposterior diameter of the adult eye
23-25mm
Transverse diameter of adult eye
24mm
Average ACD
3.11mm
Average volume of anterior chamber
220 uL
Posterior chamber colume
60uL
Total volume of adult eye
6.5-7ml
Volume of vitreous gel
5-6ml
Grossly what are the 3 layers ofthe globe
outer protective layer middle vascular inner neural layer
Uvea is made up of
Choroid, Ciliary body, iris
What are the 3 layers of the precorneal tear film
Lipid
Aqoud
Mucin
Lipid layer of pre corneal tear film produced by?
Meibomian gland
Aqueous layer of pre corneal tear film produced by?
Lacrimal gland
Mucin layer of pre corneal tear film produced by?
goblet cells
What mediates the interaction of the mucoaqueous layer with the surface epithelial cells of the corena
Glycocalyx
Is the cornea vascular or avascualr
Avascualr
What are the 5 layers of the cornea
Epithelium
Bowman Layer
Stroma
Descemet
Endothelium
Cornea radius of curvature
7.8mm
Cornea refractive index
1/376
Dioptre power of cornea
43.25
Total refractive power of eye
58.60
Cornea derives nutrients from?
Aqueous humour
Horiszontal diameter of cornea
12mm
Vertical diameter of cornea
11mm
Which is more curved - posterior or anterior surface of the cornea
Posterior
Where is the cornea thinnest
centrally
Where is cornea flatter
in the periphery
Anterior surface of corena is covered by _________ ____ ______ epithelium
Non keratinized
stratified
squamous
How many cells layers is the nonkeratinized stratified squamous epitherlium
4-6layers
How thick is the non keratnized stratifies squamous epithelium
40-50 micormeter
Corneal surface epithelial cells are attached by?
Tight junctions
After injury is Bowman’s layer restored
No forms scar tissues
After injury is Descemet layer restored
Yes
Corneal stroma is _% of total corneal thickness
90%
THe stroma is composed of ______-_____ _____, ground substance and ______ ______
collagen producing keratocytes
collaged lamellae
Ground substance is made up of ?
Proteoglycans
What is the basal lamina of the corneal endothelium
Descemet membrane