Our eyes are made up of three layers, known as tunics, which enclose three transparent structures. The outermost layer is composed of the cornea, which focuses incoming light, and the sclera, which is the protective white area of the eye. Both are connected by a ring called the limbus. The middle layer is known as the vascular tunic, and consists of the choroid, ciliary body, and iris, which is the adjustable pigmented circle around the pupil. The third and innermost layer consists of the retina, which allow for light perception, color differentiation and depth perception through the use of photoreceptors that are connected to neurons and the optical cord. Between the middle and innermost layers are the aqueous humour, the vitreous humor, and the flexible lens. The aqueous humour is a clear fluid found in the anterior chamber between the cornea and the iris, and the posterior chamber between the iris and the lens. The lens is strapped to the ciliary body by ligaments, which itself is made up of fine transparent fibers and the clear jelly of the vitreous body fills the chamber behind the lens.
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...s no cure for AMD, however a person with this disorder can have anti-angiogenic drugs injected directly into the eye or use photodynamic laser therapy to slow the progression of the disease.
Our eyes provide the sense of vision; they are the windows to our world. They equip us with an awareness of position, shape, brightness, distance, and movement of visual stimuli. Vision requires a system of photoreceptors, which take snap shots of the world around us, transforms them into nerve impulses and sends them to the visual cortex in the brain to be interpreted. Most of us take the sense of vision for granted; however, it is a naive assumption, as the eyes can quickly deteriorate leaving a person partially or fully blind. Regular eye exams, maintaining a healthy diet, exercise and wearing sunglasses are recommended to keep these vital organs serving us for years to come.
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