This is something that can weird a witness out and has a fancy name: nocturnal
lagophthalmos.
As the disease becomes more advanced, exophthalmos becomes more obvious and is associated with secondary problems such as difficulty closing the eyelids (
lagophthalmos), and subsequent drying, inflammation, and ulceration of the cornea and / or conjunctiva.
This results from a combination of anatomic features including shallow orbits, exophthalmos, a large eyelid opening (macroblepharon) and
lagophthalmos.
Cats with a short flat face or prominent facial folds are more prone to develop this condition, especially if the cat also has
lagophthalmos (bulging eyes).
These breeds of cats may have
lagophthalmos and they are predisposed to lower eyelid entropion.
The dorsal sclera may be exposed and prominence of the globe may prevent closure of the eyelids while sleeping (nocturnal
lagophthalmos).
The UK Kennel Club has taken efforts to redress these associations, with «excessively prominent eyes» and «incomplete blink» (
lagophthalmos) identified as points of concern for the French Bulldog in Breed Watch [1].