How do I bill for photos of the optic disk or macula that I take with the EyeRes system on my slit lamp?

The photodocumentation procedures are defined by “what did you photograph” not by “which instrument did you use to photograph it.”  Photos of the optic disk and macula are fundus photographs, regardless of how you acquired the image. You should bill for CPT 92250 Fundus Photography, after completing your I&R.