What is a visual system?
people get most of the sensory information from the visual system; The light that hits the eyes is converted into electrical pulses, which are then interpreted by the brain. The visual system consists of eyes, optical nerve and occipital brain lobe. The eyes are the most sensitive of all sensory organs that quickly adapt to light changes and are able to detect up to 10 million colors. The ability to monitor the movements of objects and predict their future trajectory is another ability of human vision. Most animals lack vision of movement because their retina do not create aftermages. The eye has a hard cover of a transparent material called cornea. As the light passes through the cornea and the pupil, the size of the pupil changes with the amount of light available. The color part of the eye, Iris, allows the pupil to expand in the lower light and retain themselves under clear conditions. Images hit, located just behind the pupil.
when the lightThe particles pass through the lens, the lens focus on the retina. The convex shape of the lens turns the image upside down as it hits the retina. Human retina contains millions of photoreceptors that use specialized proteins to convert an image into electrical pulses, which then process the brain. Two main types of photoreceptors can be found in the retina: rods and cones. Rods provide information about the size and shape of objects and the cones will pick up red, green or blue light and provide information about color and fine details.
People have binocular vision to place their eyes. Each eye lifts the same image slightly out of phase with the other. Each eye has an optical nerve that passes to the opposite side of the brain and connects to the occipital lobe.
When the picture travels to the brain, the occipital lobe forms a three -dimensional version of the picture. The perception of depth suffers in the absence of one eye. The visual system relies on the lens to have the right focus. Otherwise, myopia or foresights occur.
you willThe problems with the visual system include cataracts or astigmatism. Cataracts are thin movies that are formed above the cornea and stop the light into the eye. Astigmatism is a condition in which the cornea is too curved to refract the light on the retina. Goggles and contact lenses change the effective shape of the eye, allowing the light to focus correctly on the retina.