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Impressum
How deep can we go? Change of viscoelastic properties of the cornea due to tissue removal of differnt depth
1Förster W., 1Stupp T., 1Taneri S., 2Kasprzak H.
1Eye-clinic of the University Münster, 2Dept. of Physics, Tech. University of Wroclaw
Purpose: To investigate the change of viscoelastic properties
of the cornea after PRK or LASIK procedures in bovine corneas of intact
enucleated eyes.
Method: In group A intended free caps were cut with a microkeratom
with different thickness of the flap tissue of 15%, 35% and 50% of the
corneal thickness. In group B three symmetric 5mm ablations of 10%, 30%
and 50% of the corneal thickness were performed. The change of viscoelastic
properties of the cornea was investigated by means of double-exposure
holographic interferometry.
Results: 50% removal of tissue resulted in clear qualitative change
of holographic interferometric fringe pattern. In group A and B some corneas
showed this change at 30% / 35% depth of ablation.
Conclusion: These experimental results show that it is not enough
to leave about 50% of the corneal tissue untouched in refractive surgery
because some bovine eyes show a qualitative change of the holographic
fringe pattern at 30% / 35% depth of tissue removal. This change of the
fringe pattern indicates a change of the viscoelastic properties of the
eye. In refractive surgery it might be important to develop a system to
measure the individual viscoelastic properties of the cornea before surgery.