An adaptor for attachment to an image acquisition device, the image acquisition device having one or more camera apertures for enabling capture of one or more images entering the image acquisition device via the one or more camera apertures. The adaptor has a housing defining a passage along which light waves may travel, an objective lens arrangement within the passage, a secondary lens arrangement within the passage positioned such that, when the adaptor is attached to an image acquisition device, the secondary lens arrangement is along a possible light pathway between the objective lens arrangement and one or more camera apertures. The lens arrangements are together configured to magnify an image of a pupil of the eye in proximity to a plane of one or more camera apertures and to focus light waves from a light source at a point external of the adaptor and offset from the optical axis of the objective lens.