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The class Mammalia have a diverse group of organisms, most of which reproduce by giving birth. Human beings (scientifically denoted asHomo sapiens) also belong to this class and are placed under the order Primate.

The characteristic features of humans are that they exhibit bipedal locomotion (movement based on two limbs) and have the ability to socialize among other members of the genus through speech.

Human beings have the ability to analyze five distinct sensory information. The ears are concerned with the sense of hearing. The tongue helps in detecting taste; the skin is involved in detecting a sense of touch, temperature, and pain, while the sense of vision is monitored by the eyes and nose sense smell.

The human eyes are almost spherical in shape and are divided into three distinct layers; each layer has different structures that are in accordance with the eye鈥檚 functioning.

The conjunctiva is a membranous structure that forms the inner layer of the eyelid, and is concerned with the production of mucous. This mucous helps in lubricating the structure of the eyes and also destroys the microbes; thus, it prevents infection and facilitates eye movements for proper vision.

The sclera is the outer structure that accounts for the eye鈥檚 curved shape; this shape facilitates focussing on both near and distantly placed things.

The lens is another crucial eye structure that helps in focusing the light rays that enter via the pupil and transmit it towards the retina layer for processing and image formation.