based on corneal topography determination , intraocular pressure measurements and a derived elastic theory the corneal tissue mass ( m ) , tissue strength ( young 's modulus in steady state y ( s ) , and the ocular rigidity ( e ) were determined . y ( s ) and e was found to be significantly decreased , whereas m seems to be equal in keratoconus compared with normals . histologically cornea consists of an amorphous matrix in which the collagen fibers are embedded . e seems to reflect the immediate elastic response of the collagen fibers ( y ( i ] , which , however , may be relaxed in steady state .
C0015392
ocular
C0022578
keratoconus