Fig. 3.

(A) The first 540 lines of data acquired from the scan pattern illustrated in Fig. 2. Each small corneal profile contained 100 lines of data from 5 different radial slices. The full distributed volume was acquired in 1.1 seconds. (B) Each acquired corneal profile consisted of 100 active lines and 10 inactive lines. Five slightly offset profiles were used to reconstruct the final corneal slice. The centers of all five profiles of a given slice were automatically registered to one another to provide axial and lateral translation information. This was done for all twenty radial slices. (C) Using the information from the middle diagram, all A-scans were automatically shifted back to their correct axial and lateral positions to reconstruct all twenty meridians. The anterior and posterior surfaces were automatically segmented for all twenty meridians. This information was used to calculate the surface curvatures.