Common eye problems in dogs include cataracts, nuclear sclerosis, corneal ulcers and conjunctivitis. Cataracts and nuclear sclerosis are very similar in appearance, making them easy to confuse, but nuclear sclerosis is normal and occurs with age, says Organic Pet Digest.
Unlike cataracts, nuclear sclerosis can blur a dog's vision but does not cause blindness. Cataracts, a usually genetic problem in which the lenses of the eyes become clouded, cause a dog's vision to deteriorate with time, to the point of eventual blindness. A corneal ulcer is an injury that usually involves a scratch caused by some foreign body in the eye, or possibly a scratch, states Organic Pet Digest.
Conjunctivitis, commonly called pink eye, is an inflammation of the conjunctiva, the coating over the eye. It causes watery eyes and itching and may spread to both eyes, says WebMD.