1. A wearable device configured to capture eye fundus images, comprising: a support structure configured to be worn by a subject; a display device coupled to the support structure, the display device configured to display an overlay image including a cursor in a field of view of the subject, wherein the display device comprises: a projector configured to project a pattern of light representing the overlay image; and a prism disposed in the field of view of the subject, the prism configured to direct at least a portion of the pattern of light towards an eye fundus; and an image capture device coupled to the support structure, the image capture device configured to capture images of the eye fundus of the subject.