![]() At the front of the lens is the liquid aqueous humor which bathes the lens with nutrients and other things. Behind the lens is the jelly-like vitreous body which helps helps hold the lens in place. The lens is held in place by the suspensory ligaments (Zonule of Zinn), attaching the lens at its equator to the rest of the eye through the ciliary body. The lens is located towards the front part of the vertebrate eye called the anterior segment which includes the cornea and iris positioned in front of the lens. By 25 years of age the ability of the lens to alter the light path has reduced to 10 dioptres and accommodation continues to decline with age. The refractive power of a younger human lens in its natural environment is approximately 18 dioptres, roughly one-third of the eye's total power of about 60 dioptres. In land vertebrates the lens is flatter on its anterior side than on its posterior side, while in fish the lens is often close to spherical.Īccommodation in humans is well studied and allows artificial means of supplementing our focus such as glasses for correction of sight as we age. ![]() Accommodation is analogous to the focusing of a photographic camera via changing its lenses. In many fully aquatic vertebrates such as fish other methods of accommodation are used such as changing the lens's position relative to the retina rather than changing lens shape. This adjustment of the lens is known as accommodation (see also below). In many land animals the shape of the lens can be altered, effectively changing the focal length of the eye, enabling them to focus on objects at various distances. ![]() Along with the cornea, aqueous and vitreous humours it refracts light, focusing it onto the retina. The lens, or crystalline lens, is a transparent biconvex structure in most land vertebrate eyes.
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