An eye disease can refer to any of the diseases or disorders that affect the human eye. Eye problems are treated within the field of ophthalmology. Age-related eye diseases are the leading cause of blindness and low vision. A few major eye diseases are macular degeneration, cataract, diabetic retinopathy and glaucoma. Amblyopia and strabismus are other common eye disorders. Most eye diseases have no early symptoms. The patient might not notice any pain or changes in the vision until the disease has become quite advanced. Ophthalmology is involved in the diagnosis of eye diseases in the initial stages through regular checkups. The book aims to shed light on some of the unexplored aspects of eye diseases and the recent researches in this field. It is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of ophthalmology. This book includes contributions of experts and scientists which will provide innovative insights into this field.