Enlarging Attachment for Binocular Indirect Ophthalmoscopy A retrofittable attachment that provides increased magnification of the back of the eye (the ocular fundus).Background: Indirect ophthalmoscopy is performed by an examiner with the use of a binocular indirect ophthalmoscope (BIO). The examiner uses a headset to view an image of the patient’s eye in a condensing lens hand-held by the examiner at... Category(s): Technology Classifications > Imaging, Technology Classifications > Medical Devices, Campus > SUNY College of Optometry