When to go to the dentist for a checkup it’s common for s/he to take an x-ray of your teeth. They will then use these x-rays to assess the health of your teeth.
An ophthalmologist can not take an x-ray of the optic nerve so instead we take an optic nerve photo.
The great thing about the photos is that they are stored digitally so they can easily be brought up to compare.
Should the patient ever move and thus have a new ophthalmologist we can easily forward them onto their new doctor.
We use the photo to assess the health of the optic nerve. Should there be a glaucoma or anything else that is impacting the optic nerve, we will be able to see that.