Retinal Retinal Photography or imaging takes a digital picture of the back of your eye.
It shows the retina (where light and images hit), the optic nerve and blood vessels. This helps to determine if there are any diseases, swelling, or damage to the Optic Nerve.
Its crucial with Hypertensive Retinopathy, Glaucoma, Diabetic Eye Disease and many other ocular pathologies. Most insurances do cover this valuable tool.