. . . "If they do not shrink back, it may indicate an eye, brain, blood vessel or nerve disease.What to do: If your pupils change size suddenly and don???t return to their previous size, see your healthcare provider???especially if pupil changes are accompanied by symptoms such as blurred or double vision, eye pain, sensitivity to light, fever, headache, nausea or stiff neck.A veil across your field of v" . .