Measuring optical power of a lens using a variable focus camera

A method of operating an electronic device with a variable focus camera, the method comprising:

• using the variable focus camera, capturing at least one image of at least one target through a lens;
• using the at least one image of the at least one target, determining a first optimal optical power associated with a first meridian, a second optimal optical power associated with a second meridian, and a third optimal optical power associated with a third meridian;
• and
• using the first, second, and third optimal optical powers, determining a spherical power, a cylindrical power, and a cylindrical axis for the lens.

An electronic device, comprising:

• a display;
• a speaker;
• a variable focus camera;
• and
• control circuitry configured to:
• use the variable focus camera to capture at least one image through an external lens;
• using the at least one image, determine a spherical power, a cylindrical power, and a cylindrical axis for the lens;
• and
• using at least one of the display and the speaker, output lens information based on the spherical power, the cylindrical power, and the cylindrical axis.