Method and apparatus for a self-focusing camera and eyeglass system

A time difference apparatus comprising:

• a plurality of Plane of Depths (PODs) in an Light Field Photograph (LFP) image;
• a first plane at a first POD is in focus, wherein a crystalline lens of an eye is characterized by a first thickness;
• an electromagnetic radiation propagates through the first thickness in a first delay time, wherein a second unfocused plane selected from the remaining plurality of PODs becomes focused by adjusting the crystalline lens of the eye to a second thickness;
• the electromagnetic, radiation propagates through the second thickness in a second delay time;
• and
• a time difference in propagation delay between the first delay time and the second delay time,
• wherein the time difference corresponds to a depth variation between the first plane and the unfocused plane.

A time difference apparatus comprising:

• a plurality of Plane of Depths (PODs) in an Light Field Photograph (UP) image;
• a first plane at a first POD is in focus, wherein a lens configured to present the image is at a first thickness;
• a first delay time, wherein the first time delay is for an electromagnetic radiation to propagate through the lens;
• a second plane selected from the remaining plurality of PODs, wherein the lens is configured to adjust to a second thickness;
• the electromagnetic radiation propagates through the lens in a second delay time;
• and
• a time difference in propagation delay between the first delay time and the second delay time, wherein the time difference corresponds to a lens thickness variation.