Define sensation and elucidate the processes of vision with the structure of eye.

Sensation is the process that allows our brains to take in information via our five senses, which can then be experienced and interpreted by the brain. Sensation occurs thanks to our five sensory systems: vision, hearing, taste, smell and touch. Each of these systems maintains unique neural pathways with the brain which allows them to transfer information from the environment to the brain very rapidly. Without sensation, we would not be able to enjoy the sunny spring day at the park.

Each sensory system contains unique sensory receptors, which are designed to detect specific environmental stimuli. Once detected, sensory receptors convert environmental stimulus energy into electrochemical neural impulses. The brain then interprets those neural messages, which allow the brain to experience and make decisions about the environment. Let's take a little bit closer look at the process of sensation by examining each of the five sensory systems involved.

The eye is an important and one of the most complex sensory organs that we humans are endowed with. It helps us in visualizing objects and also helps us ____ _______ __________ _________ __________ _______ ____ _________ ________ ________ ___ _____.
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