The lining of the back of eye containing two types of light receptor cells (rods and cones).Ĭontains the light receptors, which trigger electrical impulses to be sent to the brain when light is detected. Slacken or stretch as the ciliary muscles contract or relax, to adjust the thickness and curvature of the lens. Muscles connected to the lens by suspensory ligaments.Īdjust the shape of the lens to make it more or less curved, so as to increase or decrease the refraction of light.Ĭonnect the ciliary muscles to the lens and hold the lens in place. The word 'sclera' comes from the Greek word 'skleros,' which means hard. Wolynski, OD Print The sclera of the eye is better known as the white of the eye. The amount of refraction can be adjusted by altering the thickness and curvature of the lens. The Function of the Sclera in a Human Eye By Jennifer Whitlock, RN, MSN, FN Updated on JMedically reviewed by Bryan M. The lens changes shape to help the eye focus on objects up close. The lens focuses light toward the back of the eye. Refracts light to focus it onto the retina. Muscles in the iris dilate (widen) or constrict (narrow) the pupil to control the amount of light reaching the back of the eye. It is attached to the ciliary muscles by the suspensory ligaments. The retina takes the light the eye receives and changes it into nerve signals so the brain can understand what the eye is seeing. Transparent, bi-convex, flexible disc behind the iris. These relax or contract to adjust the size of the pupil.Ĭontrols how much light enters the pupil.Īllows light to pass through as it enters the eye. The lens further refocuses that light onto the retina, a layer of light-sensing cells lining the back of the eye that starts the translation of light into. Refracts light as it enters the eye (by a fixed amount).Ĭoloured part of the eye that contains muscles. Tough, transparent covering over the front part of the eye. There are a range of tissues in the eye that work together to allow it to carry out its function. In other words, it focuses the light rays that pass through it (and onto the retina) in. The eye is a sense organ containing receptors sensitive to light intensity and colour. By changing its shape, the lens changes the focal distance of the eye. Greg Foot demonstrates how the eye works and what happens if someone is long- or short-sighted
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