“Normal” eyelid conformation for dogs is taken to be an almond shaped palpebral fissure (eyelid opening) with the lids resting on the globe and a small amount of scleral show (white area outside the cornea) on the outside corner but none nasally.

The breed standards for many breeds unfortunately call for eyelid conformation that deviates from this ideal. This is important as the eyelid conformation affects eyelid function: to cover and protect the eyes and vitally, to spread the tear film. This means that many breeds are predisposed to eye disease are due to poor eyelid design.