Flashcards in Corneal Function Deck (22):
How does the cornea refract light?
curvature of ant and post surface
change in refractive index
Power of Cornea
Maximizing Corneal Light Transmission
smooth optical surface / tear film
regularity of epithelial cells
no blood vessels
correct arrangement of collagen in stroma
<1% light scatter
Corneal Protective Functions
blink away microbes = decrease infections
prevent retinal damage by blocking UV and penetrating injuries
Normal CV of Endothelium
Normal Endothelial Cell Density
Hexagonality of Endothelial Cells
Size of Stromal Collagen Fibrils
Spacing between Stromal Collagen Fibrils
Stroma should consist of ________% water
75 - 80
Dua's Layer can withstand up to _______ pressure
Epithelium has ______ that help maintain hydration
Stroma uses ________ to pull water in
Endothelium plays what role in hydrating the cornea?
Corneal Hydration is dependent on...
barrier function of epithelium and endothelium
water and ion transport through epi and endo membranes
anionic characteristics of materials in stromal matrix
Pressures of 50 mmHg has what effect?
moves extra water into stroma from ant chamber, which overwhelms the endothelial transport system
Corneal abrasions can break the barriers of....
causes edema/ haziness
Allows the cornea to heal so rapidly
peptide growth factors
infectious condition that compromises that integrity of the epithelium
Hydrophobic/ nonpolar parts of cornea
epithelium and endothelium
Hydrophilic/ polar part of cornea
sucks water in