Illustrate the theory of Goldman according to corneal transparency.
Goldman's Theory:
The fibrils are small in relation to light and do not interfere with light transmission unless larger than half a wave length of light.
Corneal Avascularity
Cornea is an avascular structure, except for its peripheral 1 mm, where small loops of vessels encroach. Progressive vascularization can interfere with transparency.
Corneal Hydration
The normal water content of cornea is 78 per cent. 'The state of relative dehydration is necessary for corneal transparency.