The eyes are the window to...the pancreas?

[Northerner]

A part of the pancreas that produces and secretes insulin - and is therefore essential for maintaining normal blood sugar levels or responsible for diabetes - is largely inaccessible. But now, researchers have found a way to study the insulin-producing cells: by transferring them to the eye.

Researchers from Karolinska Institutet in Sweden say this technique enables the eye to serve as a sort of window into health reports from the pancreas.

http://www.medicalnewstoday.com/articles/269057.php