London eye, revolving observation wheel, or ferris wheel, on the south bank of the river thames. The first line of protection of the eyes is provided by the lids, which prevent access of foreign bodies and assist in the lubrication of the. Ophthalmology, medical specialty dealing with the diagnosis and treatment of diseases and disorders of the eye.
The anatomy of the eye includes auxiliary structures, such as the bony eye socket and extraocular muscles, as well as the structures of the eye itself, such as the lens and the. When light enters the eye, it passes through the cornea and the lens and is refracted, focusing an image onto the retina. Eye colour, heritable phenotypic (observable) trait determined by pigmentation and light scattering in the iris of the eye.
The iris, the coloured part of the eye, is the ring of muscle and collagen. As dark adaptation proceeds, convergence of rods increases. The first ophthalmologists were oculists. The spectrum, obtained by refracting light through a prism, shows a number of characteristic regions of colour—red, orange, yellow,.