In rarer cases the thickening and congestion of the membrane increases, and the articular capsule becomes so distended with the increased synovia and accumulated inflammatory discharges that a kind of chemosis occurs.    From Wordnik.com.  [Diseases of the Horse's Foot] Reference

Erysipelas is attended with much swelling, extending beyond the lids and causing the mucous membrane to protrude beyond the edge of the eyelid (chemosis).    From Wordnik.com.  [Special Report on Diseases of the Horse] Reference