Distichiasis is a condition in which abnormal hairs form in oil glands located on either the upper or lower eyelid. The abnormal hairs often grow into the cornea, the clear outer layer of the eye, and create painful abrasions known as corneal ulcers. Left untreated, these ulcers may become infected and severely impair vision.

The symptoms of distichiasis include eye pain that causes squinting and/or pawing at the eyes, tearing, bloodshot eyes and a darkening of the cornea.

Although the exact mechanism is unknown, distichiasis is believed to be an inherited disorder.

A physical examination of the eyes can diagnose distichiasis. Further testing may be performed including using fluorescein dye to identify corneal ulcers and a Schirmer test to measure tear production.

Treatment depends on the severity of the case. Very mild cases may not require any treatment, or your vet may prescribe eye lubricating ointments to protect the cornea. More severe cases may require surgery to remove the abnormal hair follicles.

Since distichiasis is believed to be an inherited condition, afflicted dogs should not be bred. Likewise, you should not acquire a dog with a family history of this condition.

No, humans cannot contract distichiasis from affected dogs.