Two-color varieties always have a white base color with areas of the second color. Beagles may also be affected by a range of eye problems; two common ophthalmic conditions in beagles are glaucoma and corneal dystrophy. 'Cherry eye', a prolapse of the gland of the third eyelid, and distichiasis, a condition in which eyelashes grow into the eye causing irritation, sometimes exist; both these conditions can be corrected with surgery. They can suffer from several types of retinal atrophy.