Is yellow eyes a result of jaundice or pyridine?

It could be. : "yellow eyes" comes from increased levels of bilirubin in the blood. It can subsequently causes staining in the conjunctiva and skin. Bilirubin comes from breakdown of red blood cells in the spleen which are removed via the liver. Since exposure to pyridine can cause liver damage, if there is enough exposure, it may be possible that bilirubin levels may increase.

Yellow Appearance: There are conditions that can make the eyes look yellow but not be from jaundice. Many eyes have a yellowish growth to either side of the cornea called a pingueculum. It is on the conjunctiva, it may be raised a little, and it may have injected blood vessels around it. It is a benign growth and rarely causes any problem. Also, after a broken vessel on the eye a yellowish pigmentation may remain.