images obtained by a swept source oct system u03bb 1300 nm u03b4 u03bb 100 nm for the model eye by using a conventional telecentric scan fig5 left and the scanning system according to the preferred embodiment fig5 right are shown the distortion observed in fig5 has a good agreement with the distortion theoretically predicted each image consists of 400 a scans the snr for each interface was obtained by dividing the peak amplitude corresponding to a particular interface by the average of a portion of the noise floor the region used for averaging the noise floor was kept consistent for each a scan the snr values for each interface were then averaged over all a scans an average snr improvement of 5 and 12 db was obtained for the anterior and posterior lens surfaces respectively for the posterior corneal surface snr improvement of 4 db was observed while the snr improvement for the anterior corneal surface was 0 7 db fig7 shows the distortion corrected surface profiles along with the fitted circular curves the fitted values are nearly identical to the actual values with a relatively small discrepancy these errors might arise because of slight tilt and decentration of the artificial cornea and lens in the model eye and the flat surface to be used as the reference from the above the following may be concluded the proposed scanning method significantly increases scan depth and snr a larger diameter of the posterior surface of the lens is thus imaged without pupil dilation anterior segment oct with.