A distichia is an abnormal eyelash growth that occurs within the margin of the eyelid (rather than eyelid skin) through the meibomian gland opening or through the ducts; however, they may crop up at other locations in the eyelid margins. These extra eyelashes condition is called distichiasis (double eyelashes).
Similar to ectopic cilia, sometimes dogs affected may be extremely uncomfortable. Mostly, dogs are completely unaffected but when the distichia (plural distichiae) make the dogs scratchy, they rub painfully on the subtle and nerve-rich cornea and cause corneal ulcers.
Mostly, more than one eyelash arises from each duct and there will be multiple distichiae. Distichiae can be found on either the lower or upper eyelid. Most of the time, they will be found bilaterally (on both eyes).
Commonly with distichiasis, a dog will rub or scratch at its face or eyelids due to irritation. This can lead to secondary inflammation of the inner surface of the eyelid called palpebral conjunctiva.
There are several factors for the eye irritation that can lead to blepharitis. This can be agonizing and may be severe enough that, if not left untreated, it could be an impediment to your dog’s vision.