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Light enters the eye; it will come into contact with a photosensitive chemical. Vitamin A deficiency can lead to vision problems. Rhodopsin will decompose when exposed to light; because the light will lead to rhodopsin in the retinal physical changes have been converted to all Trans retinal. Retinal molecule is angular, and all Trans retinal is linear molecules. Rhodopsin can be decomposed into several intermediate compounds, but it will eventually change form rhodopsin. This Cheap Oakleys Frogskins Sunglasses Sale chemical can produce electrical pulses; electronic pulse is transmitted to the brain, the brain to be interpreted as light. When the light is activated rhodopsin, it will lead to cyclic GMP decreases and increases the charge. This will generate a current in the cell around. As the light increases, there will be more rhodopsin is activated, it will produce a stronger current. Electronic pulse is transmitted to ganglion cells, and then spread to the optic nerve. Here, the retinal nerve fibers within the brain, leading to the other side, the retina leading to the outside of the nerve fibers.
These fibers eventually reach the back of the brain. This location is called the basic visual cortex of the brain where the electrical impulses are interpreted as visual signals. Must re-form rhodopsin can be repeated to produce visual process. All-trans -retinal into retinal and posit combined with dark, they form rhodopsin; rhodopsin when exposed to light after it will start the process again. Depending on the color-sensitive cone cells, the chemical substance called cone pigments, and rod cells are very similar in chemical substances. Two chemicals in the retinoid composition are the same, but the dark posit protein is replaced by the light. Thus, a sense of color pigment is retinal and posit composed of light. Through the three colors to reconcile the human eye can perceive almost any color variations.
Color blindness is unable to distinguish between different colors; the most common are red-green blindness. The cause is the lack of a sense of red or green-sensitive cone cells, or both cell dysfunctions. Were not entirely seen red or green, but often confuse these two colors. Color blindness is a genetic disorder, is more common in men, it is because a color vision capabilities exist on the X chromosome. Females have two X chromosomes, so get at least one with normal color vision capabilities of the X chromosome high probability; while males have only one X chromosome. Do not see any color or shades of gray can only see the situation is rare. Vitamin A is necessary for the formation of retinal elements, and retinal rhodopsin molecule is a part. If due to lack of vitamin A causes low levels of light-sensitive molecules, the eyes absorb light at night may not be sufficient to produce Tiffany and Co Bracelet Jewelry Outlet visual. Although the day retinoid low level, but because there is enough light stimulation, it is able to produce vision. Visual acuity, you can stand at twenty feet distance visual acuity for reading. Through the observation of a large crowd, ophthalmologists have mastered the normal vision should be able to see at six meters what content on the eye chart.
Astigmatism is due to uneven curvature of the cornea of the visual distortion. To correct astigmatism, the cornea is uneven situation need to make lenses. It is the loss of the ability to change shape. This is called Presbyopia, in performance, especially when you feel to see near objects clearly, because the culinary body must shrink, so that the lens thickens. Lens and inflexible will not thicken. Therefore, you can not focus on close objects. People will get farther objects. This situation will become more apparent at the age of forty or fifty. The shape of the Cheap North Face Denali Jackets Sale lens can not be changed, so they remained a constant focal length. Presbyopia needs bifocals to be corrected. Bifocal lens is actually divided into upper and lower halves, the second half of the lens used to see near objects, look at the distance for the first half of the lens. If you already know from experience the size of an object, then the brain will be based on the size of the object on the retina to measure distance. Turning the head, the closer objects will move quickly on the retina. The movement of distant objects becomes negligible. Thus, the brain is able to determine the approximate distance to the object.
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