Wide-angle pupil relay for cellphone-based fundus camera
AssigneeNikon Corporation
InventorDavid M. Williamson
Life of this patent
Estimating the term…
Abstract
An optical imaging system includes a first lens system housed in a body of a mobile telecommunication device, the first lens system having a first optical axis, a first entrance pupil fixed in space in a reference plane associated with said body, and a first focal length; and an optical telescope providing a diffraction-limited imaging within a spectral range from at least 486 nm to at least 656 nm. The optical imaging system is configured to image, when the optical telescope is inserted between the first lens system and an entrance pupil of a visual system of an eye (EPE), the EPE onto the first entrance pupil and vice versa with a substantially unit magnification.
Claims9
A portable handheld relay optical system for forming an image of a fundus of a subject eye to be examined, said relay optical system being configured as an attachment optical system to be disposed between a portable handheld imaging device and the subject eye, the relay optical system, comprising:
- a first positive lens group G1 and a second positive lens group G2, wherein:
- the first positive lens group G1 and the second positive lens group G2 form an afocal system having an identical optical axis, and are configured to form a conjugate relationship between a pupil of the subject eye and a pupil of the imaging device when the relay optical system is inserted between the imaging device and the subject eye, and
- the first positive lens group G1 and the second positive lens group G2 substantially form an afocal relay system, and the following condition is satisfied:
- 0.9<f2/f1>2.2,
- in which f1 is a focal length of the first positive lens group G1, and f2 is a focal length of the second positive lens group G2.
Dependencies are inferred from the claim text.