Please enable JavaScript.
Coggle requires JavaScript to display documents.
"SCHEMA INGLESE READING: THE CORNEA" - Coggle Diagram
"SCHEMA INGLESE READING: THE CORNEA"
What is it?
transparente anterior portion of the outer coating covering the iris and the pupil
most important refractive surface
if damaged causes serious effects to vision
nerve fibres are very sensitive to pain
Tears
protective action
90% thickness of the cornea
Stroma
supporting tissue composed of lamellae
Normal conditions
abosorb liquid from the aqueous humour and the blood vassels
this is the result of an adequate energy supply
No normal conditions
there is lack this energy
the pump stops working or works slowly: the cornea swells
death and its consequent decreasing of the body temperature
failure this pumping action
Corneal transplant
dead eye in a warm chamber
will keep trasparent for 24 hours or more
reserve of the metabolic energy
resume the previous transparency, the cornea must be kept at about 31°C