The human eye provides a three-dimensional moving image that is normally colored during the daytime. There are many changes in the eye and its surrounding areas due to various disorders and diseases, and aging. Eye tumor, excessive tearing, dry eyes, macular degeneration, cataract, glaucoma, etc. are some of the common eye diseases caused by various internal and external factors. The aging process is one of the prominent reasons for certain changes in the eye. The most functionally important changes in the non-diseased eye are the loss of accommodation or focusing capability and a reduction in pupil size. From theories to research to practical applications, case studies related to all contemporary topics of relevance to ophthalmology have been included in this book. It presents the complex aspects of diagnosis and management of eye diseases in the most comprehensible and easy to understand language. The readers would gain knowledge that would broaden their perspective in this field of study.