Scanning and processing using optical coherence tomography

1. A method of eye examination, comprising:

acquiring OCT data with a scan pattern centered on an eye cornea that includes n radial scans repeated r times, c circular scans repeated r times, and n* raster scans where the scan pattern is repeated m times, where each scan includes a A-scans, and where n is an integer that is 0 or greater, r is an integer that is 1 or greater, c is an integer that is 0 or greater, n* is an integer that is 0 or greater, m is an integer that is 1 or greater, and a is an integer greater than 1, the values of n, r, c, n*, and m being chosen to provide OCT data;

obtaining a corneal topography image; and

processing the OCT data by

obtaining a pachymetry map from the OCT data,

obtaining a corneal anterior power map from the corneal topography image,

registering the pacymetry map with the corneal anterior power map,

generating a corneal posterior surface, and

generating a total corneal power map.

2. The method of claim 1 , wherein the pachymetry map scan pattern is defined by a=1024, r=2, n=12, c=1, n*=0, and m=1.

3. The method of claim 1 , wherein the Pachymetry scan is defined by a=2048, r=4, n=16, c=2, n*=0, and m=1.

4. The method of claim 1 , wherein processing the OCT data further includes

detecting an anterior boundary;

de-wrapping OCT images from the OCT data;

detecting a posterior boundary;

computing corneal thickness; and

constructing a corneal thickness map.

5. The method of claim 1 , wherein processing the OCT data further includes

determining anterior and posterior boundary for each radial scan;

determining anterior and posterior curvatures for each radial scan;

determining anterior and posterior powers for each radial scan;

determining anterior and posterior powers for each scan;

determining the corneal power for each scan; and

determining the net corneal power.

6. An OCT imaging system, comprising:

an OCT imager that acquires OCT data with a scan pattern centered on an eye cornea that includes n radial scans repeated r times, c circular scans repeated r times, and n* raster scans where the scan pattern is repeated m times, where each scan includes a A-scans, and where n is an integer that is 0 or greater, r is an integer that is 1 or greater, c is an integer that is 0 or greater, n* is an integer that is one or greater, m is an integer that is 1 or greater, and a is an integer greater than 1, the values of n, r, c, n*, and m being chosen to provide OCT data;

a corneal topography imager that acquires a corneal topography image; and

a computer that processes the OCT data and the corneal topography image, the processing including

obtaining a pachymetry map from the OCT data,

obtaining a corneal anterior power map from corneal anterior image,

registering the pacymetry map with the corneal topography power map,

generating a corneal posterior surface, and

generating a total corneal power map.

7. The system of claim 6 , wherein the pachymetry map scan pattern is defined by a=1024, r=2, n=12, c=1, n*=0, and m=1.

8. The system of claim 6 , wherein the pachymetry scan is defined by a=2048, r=4, n=16, c=2, n*=0, and m=1.

9. The system of claim 6 , wherein the processing further includes

detecting an anterior boundary;

de-wrapping OCT images from the OCT data;

detecting a posterior boundary;

computing corneal thickness; and

constructing a corneal thickness map.

10. The system of claim 6 , wherein the processing further includes

determining anterior and posterior boundary for each radial scan;

determining anterior and posterior curvatures for each radial scan;

determining anterior and posterior powers for each radial scan;

determining anterior and posterior powers for each scan;

determining the corneal power for each scan; and

determining the net corneal power.