Your sight

Your sight Glaucoma Dry eye disease Allergic eye conditions Eye infection Cataract Your sight The eye, physiology, diseases and conditions of the eye Glaucoma Often caused by a build-up of pressure within the eye. View Dry eye disease Eye disorder where the eyes don’t make enough tears or the tears evaporate too quickly. View Allergy An inflammation of the conjunctiva due to allergy. View The eye The eye is like a camera. It lets light in through the cornea, which is like a camera's aperture. The amount of light allowed in is controlled by the pupil, which opens and closes a bit like a shutter. The light focuses on the retina, which sends the image to the brain, acting as film would in order to record the light (the photo itself). Other eye structures support the main activity of sight: Some carry fluids (such as tears and blood) to lubricate or nourish the eye. Others are muscles that allow the eye to move. Some protect the eye from injury (such as the lids and the epithelium of the cornea). And some are messengers, sending sensory information to the brain (such as the pain-sensing nerves in the cornea and the optic nerve behind the retina). Disease or damage can occur in any of the structures of the eye, so ophthalmology is divided into many specialities. Ciliary body Sclera Choroid Retina Fovea Central retina artery and vein Optic disc (blind spot) Optic nerve Suspensory ligament Aqueous humour Cornea Pupil Iris Lens To find out more about the anatomy of the eye, visit Moorfields Eye Hospital. (last visited 24 May 2019)  Next: Glaucoma