Eye diseases and disorders encompass a wide range of conditions that can affect the vision and overall eye health of a person. A few of the common eye diseases are cataracts, glaucoma, macular degeneration, diabetic retinopathy, myopia, hyperopia and astigmatism. The diagnosis of these conditions might involve visual acuity tests, tonometry, dilated eye exams, and imaging techniques like optical coherence tomography (OCT) to provide detailed images of the eye structures. The management of eye diseases and disorders depends on the particular condition which has been diagnosed. Treatments may include corrective lenses or contact lenses to manage refractive errors, medications to control intraocular pressure in glaucoma, or surgical interventions like cataract extraction or retinal detachment repair. Early detection and intervention can often slow the progression of certain conditions and preserve vision. This book includes some of the vital pieces of works being conducted across the world, on various topics related to eye diseases and disorders. It will serve as a reference to a broad spectrum of readers.