This unique alphabet teaching book focuses your children on the fascinating world of optometry. Sight is one of the 5 senses humans have, and this book will teach your children all about it, while introducing them to the alphabet. Do you have a child that is learning the alphabet or a young one who is interested in anatomy? This is just the book for you! "A is for Astigmatism" is perfect for children age 1 to 10, who are interested in the ABC's of vision and optics.