For information contact: Facts On File, Inc. An imprint of Infobase Publishing, Inc. 132 West 31st Street New York NY 10001 Library of Congress Cataloging-in-Publication Data Guiley, Rosemary. The encyclopedia of demons and demonology / Rosemary Ellen Guiley ; foreword by John Zafï¬s. p. cm.
Optometrists dilate a person's eyes so they can see the inside and back of the eyes. An eye exam should be performed annually. An ophthalmologist examines a patient. Normally, a person's pupils contract when light is bright. Routine eye exams are painless and can help detect vision or eye problems early.
Dilatation or widening of the pupil (the center part of the iris of your eye) allows an eye doctor to look carefully inside your eye. 1  Eye drops are placed in each eye so your eye structures like the retina, macula, and optic nerve can be examined closely using a shiny light and magnifying lens. While pupil dilation is not painful, it can be visually uncomfortable to have your pupils widened.