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Color blindness is how many anomalies of color vision perception is caused by interferce or disruption.Color blindness does not always mean total absence of color. It can mean that a person may not be able to determine the correct color. Color blindness is an inaccurate term for the lack of perceptual sensitivity to certain colors. Absolute color blindness is almost unknown. There are three color preceptions in our eyes, red, green, and blue. What causes color blindness?Color blindness comes as a result of a lack of one or more of the types of color receptors. The aging process is an important factor in the pathogensis color vision deficiencies. Ocular diseases, such as glaucoma, optic neurpoathy and macular degeneration cause distruction within the retina to the photorecepters, bipolar and ganglion cells, and within the optic nerve itself. Pathologic changes occurring in the outer retina cell layers typically cause blue-yellow color vision defects, while lesions within the inner retinal layers and optic nerve usually result in red-green color deects. How often do people go color blind?Approximately 90% of people over the age of 65 years have abnormal color vision in the form of aquired defects. | |||||||||||||||||
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Are there different kinds of color blindness? There are about four types of color blindness. One type of color blindness is Rod Monochromatism. This is a rare type of color blindness. The people with this color blindness don't have as many cone photorecptors but have all the rod photoreceptors. They have normal scotopic visual functions.They can not interpret any colors as a spectral color. These people see the world in gray. Another type of color blindness is cone Monochromatism. This time the people have only one kind of cone receptors. They also can not see any colors. This color blindness is also very rare. Dichromatism is the third type of color blindness. There are three forms of dichromatism: protanopia, deuteranopia, and tritanopia. People with this color blindness, matches a spectral color with a mixture of any two primary colors. This type of color blindness can be caused by the loss of a photopigments. The last type of color blindness is anomalous Trchromats. There is also two forms of this color blindness. Anomalous Trichromats mix one primary color with any other color and they see the combination of the other two primary colors. A reason this color blindness might occur is a cone pigment might have been shifted away from the normal peak. Another reason could be that if a peak of one cone pigment colided with another. Is there anything to help color blindness? How do you know if you are color blind? Can you treat color blindness? Why do our eyes have a harder time seeing in the dark? The black and white receptors in our eyes are more sensitive than the color receptors and is the cause for a poor color perception in the dark. | |||||||||||||||||
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GLOSSARY1. 1.Attenuates- to make or become thin or small, to weaken,dilute 2. Intracellular- occuring or situated within a cell or cells 3. Metalbolic- the physical and chemical processes occuring within a living cell or organism that are necessary for life 4. Chromatic- relating to colors or color 5. Stimuli- something that is roused to activity or heightened action;excite 6. Bipolar- having two opposing sides or systems 7. Ganglion- a group of nerve cells forming a nerve center especially one located outside the brain or spinal cord 8. Retina- a delicate, multilayered, light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain 9. pigment- a coloring substance or matter, usually a powder to be mixed with water, oil, or other base 10. Anomalous- Abnormal, perculiar, doesn't follow order or rules 11. Receptors- a specialized cell or a group of nerve endings that respond to sensory stimuli 12. Spectral- produced by the spectrum 13. Cones- a photoreceptor in the retina 14. primaries- the primary colors: Red, Blue, Green | |||||||||||||||||
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