OCT imaging may be recommended when the optic nerve looks unusual on exam, to help determine whether there is thinning

https://optometryblog523.northvaledigest.com/posts/how-eye-exam-diagnostics-use-oct-to-investigate-blurry-vision-and-prescription-shifts

OCT imaging may be recommended when the optic nerve looks unusual on exam, to help determine whether there is thinning, swelling, or injury affecting vision.