![]() ![]() Conjunctiva: the thin, moist, clear membrane that covers the sclera – the white part of the eye.The primary function of the cornea is to focus and transmit light onto the retina. The cornea is the clear front window, representing one-sixth of the outer layer of your eye. The cornea contains no blood vessels and is extremely sensitive to pain. It refracts the light entering the eye onto the lens, which then focuses it onto the retina. ![]() Cornea: the transparent circular part of the front of the eyeball.Other colours are seen as combinations of these primary colours. It is thought that there are three types of cones, each sensitive to the wavelength of a different primary colour – red, yellow or blue. The human retina contains between six and seven million cones they function best in bright light and are essential for acute vision (receiving a sharp accurate image). Cone cells are the second type of light sensitive cells in the retina of the eye.Also, the ciliary body is made up of muscles that allow the eye to focus at different distances. The aqueous fluid that fills the front of your eye is made inside the ciliary body. The ciliary body is located behind your iris, near the crystalline lens. Ciliary body: the part of the eye that connects the choroid to the iris.Filled with blood vessels, the choroid’s function is to nourish the outer layers of the retina. The choroid is the spongy middle layer of your eye located between the sclera and the retina. It also contains a pigment that absorbs excess light so preventing blurring of vision. Choroid: the middle layer of the eye between the retina and the sclera.Making approximately 200,000 movements per day, the human eye is able to distinguish around 10 million colours. The vitreous chamber is filled with a thicker fluid called vitreous humour, a transparent gel which is 99% water, which helps the eyes to stay inflated. The anterior and posterior chambers are filled with aqueous humour, which is a watery fluid that provides nourishment to the interior eye structures and helps to keep the eyeball inflated. Vitreous chamber, between the lens and the retina.Posterior chamber, between the iris and the lens.Anterior chamber, between the cornea and iris.The eyeball also contains three chambers of fluid: The inner layer, comprised of the retina.The middle layer, holding the primary blood supply for the eye and containing the iris and pupil.The outer layer, formed by the cornea and sclera.The retina, which is made up by millions of specialised cells known as ‘rods’ and ‘cones’, transforms the image into electrical energy and this is sent to the optic disk on the retina, where it will be transferred via electrical impulses along the optic nerve to be processed by the brain. Just like a lens in a camera sends a message to produce a film the lens in the eye refracts incoming light onto the retina, where messages are encoded. With help from other important structures in the eye, like the iris and cornea, the appropriate amount of light is directed towards the lens. Vision occurs when light enters the eye through the pupil. Although it is small in size, the eye arguably provides us with the most important of the five senses – vision. Posterior Capsule Opacity (Secondary Cataract).The optic nerve then transmits these signals to the visual cortex – the part of the brain that controls our sense of sight. The retina acts like an electronic image sensor of a digital camera, converting optical images into electrical signals. Light focused by the cornea and crystalline lens (and limited by the iris and pupil) then reaches the retina – the light-sensitive inner lining of the back of the eye. Process called accommodation, this lens automatically helps the eye focus on near and approaching objects, like an autofocus camera lens. The eye’s crystalline lens is located directly behind the pupil and further focuses light rays. The iris (colored part) of the eye functions like the diaphragm of a camera, controlling the amount of light reaching the retina by automatically adjusting the size of the pupil (aperture). Light is focused primarily by the cornea – the clear front surface of the eye, which acts like a camera lens. In a number of ways, the human eye works much like a digital camera: Read on for a basic description and explanation of the structure (anatomy) of your eyes and how they work (function) to help you see clearly and interact with your world. How vision works or the ins and outs of eye health. When surveyed about the five senses - sight, hearing, taste, smell and touch - people consistently report that their eyesight is the mode of perception they value (and fear losing) most.ĭespite this, many people don’t have a good understanding of the anatomy of the eye, ![]()
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