Methods and systems for measuring image quality
Methods and systems for measuring the asymmetrical image quality or image features of an intraocular lens (IOL), design, refractive and diffractive designs, such as IOLs with Extended tolerance of astigmatic effects are provided by through-focus and meridian response. Measurements are taken at various focal plane and meridian positions to allow for determination of areas of better performance away from 0 meridian or the start position and meridian.
1. A method for evaluating performance of an intraocular lens, comprising:
determining an initial start position with respect to an intraocular lens (IOL) being measured and providing a charge coupled device (CCD) in the initial start position, wherein the initial start position includes an initial angular position and an initial z-axis position;
capturing a first image;
repeatedly moving the relative angular position of the CCD with respect to the IOL from the initial start position and capturing subsequent images until the relative angular position of the CCD with respect to the IOL reaches a predetermined angular stop position;
changing a relative z-axis position of the IOL with respect to the CCD and resetting the relative angular position of the CCD with respect to the IOL to the initial angular start position;
repeatedly moving the relative angular position of the CCD with respect to the IOL and capturing subsequent images until the relative angular position of the CCD with respect to the IOL reaches the predetermined angular stop position;
repeatedly moving the relative z-axis position of the IOL with respect to the CCD and capturing subsequent images until the relative z-axis position of the IOL with respect to the CCD reaches a predetermined z-axis stop position; and
determining a measure of intraocular lens performance based upon the captured images.
2. The method of claim 1 , wherein the changing of the relative z-axis position of the IOL with respect to the CCD comprises changing the relative z-axis position of the IOL with respect to the CCD by a predetermine distance.
3. The method of claim 1 , wherein the predetermined distance is 0.01 mm.
4. The method of claim 1 , wherein initial z-axis position is 2 mm and the z-axis stop position can be +2 mm.
5. The method of claim 1 , wherein the changing of the relative angular position of the CCD with respect to the IOL comprises rotating the CCD relative to the IOL.
6. The method of claim 1 , wherein the CCD is positioned on a stage and wherein changing of the relative angular position of the CCD with respect to the IOL comprises rotating the stage relative to the IOL.
7. The method of claim 1 , wherein the changing of the relative angular position of the CCD with respect to the IOL comprises rotating an image capture window angularly.
8. The method of claim 1 , wherein the changing of the relative angular position of the CCD with respect to the IOL comprises changing the relative angular position of the CCD with respect to the IOL by a predetermine angle.
9. The method of claim 8 , wherein the predetermined angle is 1 degree.
10. The method of claim 1 , wherein the predetermined angular stop position is 90 degrees relative angle of the CCD with respect to the IOL.
11. The method of claim 1 , wherein the initial start angular position of the CCD is 90 degrees relative angle of the CCD with respect to the IOL.