Measured Wavenumbers (cm-1) Significant Contribution 750 C=O out of plane 807 C=O in plane bending 826 C-O-C symmtertic stretching 838 CH2 rocking 911 CH3 rocking 964 C-C stretching 984 C-C stretching 1062 CH3 twisting 1140 CH3 twisting 1185 CH3 wagging 1237 C-O stretching 1263 C-O stretching 1387 CH2 deformation 1433 CH3 deformation 1445 CH3 deformation 1478 CH3 deformation 1719 C=O stretching 2850 C-H symmetric streching in CH2 2925 C-H antisymetricstreching in CH2 2950 C-H antiymetricstreching in CH3 2994 C-H antisymetricstreching in CH3 INTACS: Intracorneal Ring Segments

Table 1:FT-IR band positions of INTACS material and their assignments.