Visual Sensory Systems
Visual Sensory systems
Visual sensory systems rely on electromagnetic (EM) waves to give an organism more information about its surroundings. This information could be regarding potential mates, dangers and sources of sustenance
The human visual system involves communication between the eye and the brain to represent external stimuli as images.
The human visual system gives the human body the ability to see our physical environment. The system requires communication between its major sensory organ - the eye - and the core of the central nervous system - the brain - to interpret external stimuli into sight images.
Sensory Organs
Vision depends mainly on one sensory organ—the eye. Eye constructions vary in complexity depending on the needs of the organism. The human eye is one of the most complicated structures, and it requires many components to allow our advanced visual capabilities. The eye has three major layers:
The sclera, which maintains, protects, and supports the shape of the eye and includes the cornea
The choroid, which provides oxygen and nourishment to the eye and includes the pupil, iris, and lens
The retina, which allows us to piece images together and includes cones and rods.
The Process of Sight
The easiest way to understand the component pieces of the eye and how they contribute to human sight is to follow the normal processing of an image. All vision is based on the perception of electromagnetic rays. These rays, in the form of light, must pass through the cornea, which focuses the rays. They then enter the eye through the pupil, the black aperture at the front of the eye. The pupil acts as a gatekeeper, allowing as much or as little light to enter as is necessary to see an image properly. The pigmented area around the pupil is the iris. Along with supplying a person's eye color, the iris is responsible for acting as the pupil's stop, or sphincter. Two layers of muscles contract or dilate the pupil to change the amount of light that enters the
Visual sensory systems rely on electromagnetic (EM) waves to give an organism more information about its surroundings. This information could be regarding potential mates, dangers and sources of sustenance
The human visual system involves communication between the eye and the brain to represent external stimuli as images.
The human visual system gives the human body the ability to see our physical environment. The system requires communication between its major sensory organ - the eye - and the core of the central nervous system - the brain - to interpret external stimuli into sight images.
Sensory Organs
Vision depends mainly on one sensory organ—the eye. Eye constructions vary in complexity depending on the needs of the organism. The human eye is one of the most complicated structures, and it requires many components to allow our advanced visual capabilities. The eye has three major layers:
The sclera, which maintains, protects, and supports the shape of the eye and includes the cornea
The choroid, which provides oxygen and nourishment to the eye and includes the pupil, iris, and lens
The retina, which allows us to piece images together and includes cones and rods.
The Process of Sight
The easiest way to understand the component pieces of the eye and how they contribute to human sight is to follow the normal processing of an image. All vision is based on the perception of electromagnetic rays. These rays, in the form of light, must pass through the cornea, which focuses the rays. They then enter the eye through the pupil, the black aperture at the front of the eye. The pupil acts as a gatekeeper, allowing as much or as little light to enter as is necessary to see an image properly. The pigmented area around the pupil is the iris. Along with supplying a person's eye color, the iris is responsible for acting as the pupil's stop, or sphincter. Two layers of muscles contract or dilate the pupil to change the amount of light that enters the