Patent ID: 11944383
Assignee: CARL ZEISS VISION INTERNATIONAL GMBH
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 11:
12. A method for determining a refractive error of an eye, the method comprising:
capturing a series of images of light from the eye with varying optical power in a light path from the eye to a camera used for capturing the series of images; and
calculating the refractive error of the eye based on the series of images using the series of images directly as at least approximate point spread functions,
wherein the point spread function is an intensity distribution resulting from the eye being illuminated in a single spot, and
wherein calculating the refractive error includes determining a modulation transfer area as a function of meridian angle and optical power in an angle range from 0° to 180° based on the series of images, and calculating the refractive error based on the modulation transfer area as a function of angle and optical power.