Wide-field retinal imaging system

A retinal imager for imaging a retina of an eye, the retinal imager comprising:

• a housing containing an optical system comprising:
• an illumination source operable to generate illumination light;
• a beam splitter operable to receive the illumination light and direct the illumination light along an optical axis;
• a field lens disposed along the optical axis;
• an image sensor;
• an objective lens disposed along the optical axis and operable to contact a cornea of the eye, wherein the objective lens is operable to inject the illumination light into the eye as an illumination ring;
• and
• an imaging lens group disposed along the optical axis between the beam splitter and the image sensor, wherein the imaging lens group is operable to form a sensor image at the image sensor and wherein an entrance pupil and the illumination ring are located at different positions along the optical axis.