Eye diseases and disorders encompass a wide range of conditions that can affect the health and function of the eyes. These conditions can vary in severity and may impact vision to different degrees. Some common eye diseases and disorders are refractive errors, cataracts and glaucoma. Refractive errors, including myopia, hyperopia, astigmatism and presbyopia, result in blurry vision due to an abnormality in the way light is focused on the retina. Cataracts occur when the clear lens of the eye becomes clouded, leading to blurry vision, sensitivity to light, and difficulty seeing at night. Glaucoma is a group of eye conditions characterized by damage to the optic nerve, often caused by increased intraocular pressure. It can lead to gradual vision loss and even permanent blindness. The book aims to shed light on some of the unexplored aspects of eye diseases and disorders, and the recent researches in this field. It will provide comprehensive knowledge to the readers.