Hi Rachel @rwinney, I had not heard the term before but think it is a great idea to start a new discussion. Here's some information I found when trying to learn what it is.

Corneal confocal microscopy detects small nerve fibre damage in patients with painful diabetic neuropathy:
-- https://www.nature.com/articles/s41598-020-60422-7

Corneal nerve fiber size adds utility to the diagnosis and assessment of therapeutic response in patients with small fiber neuropathy:
-- https://www.nature.com/articles/s41598-018-23107-w/

Establishing the Diagnosis of Small Fiber Neuropathy – Corneal Confocal Microscopy is Superior to Skin Punch Biopsy
-- https://www.pathlms.com/iasp/courses/11312

Hope this helps!