The Anatomy And Physiology Of The Eye

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The human eye is a wonderful organ enabling us to perform all our daily tasks. The sense of sight allows to do almost all activities. There are countless activities including studying, cooking, driving, or playing an instrument. Other tasks that vision is helpful for would be communicating, working, making life a lot easier, which are very essential. Most people would agree that vision is more valuable than the rest. The eyes allow us to interpret colors and shapes. This happens after a long complex process, starting from the reflect of light on the objects to the eyes and ends up in the brain as images. Having a healthy eye is very important and improves the quality of a person 's life. In this paper points out the very common eye…show more content…
The other two portions in this layer are the choroid, the posterior and vascular portion which supplies blood to all layers and the ciliary body which is a ring of muscles around the lens used to focus the lens. The lens has a flexible structure that can change shape to precisely focus light on the retina. The Retina is the very interior layer which consists of two layers. The pigmented outer layer which absorbs light and prevents scattering. And the Neural layer composed of bipolar cells, ganglion cells and two types of photoreceptors. The eye is protected by a cushion of fat and a bony orbit surrounding the eye 's anterior part. There are also accessory structures that protect the eye and help maintain the eye 's function. These accessory structures include the eyelids, eyebrows, lacrimal apparatus, conjunctiva, and the extrinsic eye muscles. The eyebrows function is to shade the eye from sunlight and keep out perspiration from reaching the eye. The eyelids contains the nerves that initiate reflex blinking, and protects the eye 's anterior part, because it contains eyelashes at the edges, which prevents debris or small particles like dust or sand from entering the eye. It also contains lubrication glands to keep the eye moistened, such as tarsal glands and ciliary glands. The Conjunctiva is a transparent membrane which also produces mucus. Next, the lacrimal consists of the lacrimal gland and ducts which produces
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