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Retina function eye12/30/2023 ![]() ![]() A problem with any of the three layers may cause dry eye. These create a film which covers the white of the eye and the cornea. It lies directly in front of the iris and pupil, and it allows light to enter the eye. Tears have three main components a watery component, an oily component and mucus. The cornea is the clear front surface of the eye. Vitreous humour – a clear gel that fills the inside of the eye and helps it to retain its shape. Sclera – also known as the white of your eye, this is the outer layer of the human eye. The retina is actually an extension of the brain, formed embryonically from neural tissue and connected to the brain proper by the optic nerve. The lens changes shape to help the eye focus on objects up close. retina, layer of nervous tissue that covers the inside of the back two-thirds of the eyeball, in which stimulation by light occurs, initiating the sensation of vision. The lens focuses light toward the back of the eye. Retina – the light-sensitive tissue lining at the back of your eye that converts light into electrical impulses that are sent along the optical nerve to the brain. Muscles in the iris dilate (widen) or constrict (narrow) the pupil to control the amount of light reaching the back of the eye. Pupil – this is the opening in the centre of the iris that lets in light. Optic nerve – a bundle of more than one million nerve fibres that carries visual messages from the retina to the brain. Macula – the sensitive area in the centre of the retina responsible for what you see ahead of you (central vision). ![]() Lens – the clear part of the eye behind the iris that helps to focus light, or an image, onto the retina. Iris – the coloured part of your eye that regulates the amount of light entering. Light rays pass through the pupil in the cornea.Īqueous humour – maintains the pressure in your eye and nourishes the cornea and the lens by supplying amino acids and glucose, as well as vitamin C.Ĭhoroid – a thin layer of blood vessels that nourish the retina and absorb scattered light.Ĭiliary muscles – a circular muscle that relaxes or tightens to enable the lens to change shape for focusing.Ĭornea – a clear covering on the front of your eye that focuses light entering the eye.įovea – a tiny pit in the macula that provides the sharp central vision that you need for activities, such as reading and driving. Find out about different parts of the eye.īasically, the role of the eye is to convert light into electrical signals called nerve impulses that the brain converts into images of our surroundings. ![]()
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