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Change of Surface Structure of Intraocular Lenses – Evaluation using Laser-coherence-topography

Rabsilber T. M., Schmack I., Specht H., Auffarth G. U.,
Ruprecht-Karls-Universität Heidelberg, Universitäts-Augenklinik (Heidelberg)

Purpose: To analyze the change of surface structure of intraocular lenses (IOL) caused by the folding process during IOL implantation we simulated the procedure of folding with different types of lenses and investigated the surface quality following a standardized time protocol.
Method: Several IOLs of different materials such as silicone and acrylic were folded according to the folding process during cataract surgery. All lenses were embedded with a silicone matrix before, immediately after, 30 min., 12 hours, 24 hours and 48 hours after folding. Between each step the IOLs were incubated at 37°C in BSS+ solution. Measurements were performed using the Microfocus System (UBMä).
Results: It is possible to evaluate the change of surface structure with silicone matrix by laser-coherence-topography. In all IOLs astigmatism were induced immediately after unfolding Change of the surface structure increased during incubation in BBS+ solution.
Discussion: The laser-coherence-topography seems to be a useful method for evaluating the changes of surface shape without modifying the surface structure of IOLs. Further studies could give an overview about the influence of different folding parameters concerning the remained astigmatism.


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