The book discusses about the importance of squint treatment. Squint has become an important subspecialty of ophthalmology.The book is divided into three sections. In section one it contains a detailed knowledge about squints which includes topics such as introduction on squint, anatomy of eyeball and extraocular muscle, physiology of ocular movements, binocular vision, visual acuity, accommodation, convergence and physiology of pupil, heterophoria, pseudostrabismus, manifest and concomitant squints, paralytic squint, vertical squint, musculofascial anomalies, abnormal retinal correspondence, amblyopia, nystagmus. In section two it explains about different types of orthoptic instruments, and their uses. Section three contains a detail explanation about various types of diseases in eye, its symptoms, and treatment. This book presents these entire topics in a simple way so that it will be easy for the orthoptic students to understand the subject in a better way.