Salient features of the book • Informative illustrations explaining the text in relation to the optics and various refractive anomalies are the skeleton of this book. • Accurate and precise information about the topic make this book unique in the field of optics and refraction. • Basics of elementary optics and ocular optics are made easy by colorful representation. • The topic of refraction can be mastered by reading this book as the reader can understand and correct the most difficult type of refractive errors with ease.