It's a pathologic condition of the eye's translucent biconvex body, which sits between the posterior chamber and the vitreous body or lens. The ciliary body is in charge of lens focusing. The lens is narrower and focuses light rays from distant objects when the ciliary body is relaxed. The lens zonules relax and the lens takes on a more spherical shape when the ciliary muscle contracts. This permits the lens to focus on objects that are close to it. Age-related eye illnesses such as age-related macular degeneration, cataract, diabetic retinopathy, and glaucoma are the primary causes of blindness and impaired vision.