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| − | Color blindness occurs when there is a problem with the granules (pigments ) that perceive color in certain neurons of the eye, called cones . These cells are found in the retina , the layer of light-sensitive lining the back of the eye tissue.
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| − | <A HREF="http://www.informacionopticas.com/daltonismo-tipos-e-informacion/"> Daltonismo</A>
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| − | If you only need a pigment , you may have difficulty distinguishing between red and green , which is the most common type of color blindness. If you go to a different pigment , you may have trouble seeing the blue and yellow colors. People with color blindness to the blue and yellow colors usually have problems identify reds and greens .
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| − | The most severe form of color blindness is achromatopsia . The person with this rare condition can not see any color, so all you see in shades of gray. Color blindness is often associated with lazy eye , nystagmus (small , jerky eye movements ), severe photosensitivity and extremely poor vision.
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| − | Most color blindness is due to a genetic problem (see: sex-linked recessive gene ) . Very few women are color-blind and about 1 in 10 men suffer from some form of color blindness.
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| − | The drug hydroxychloroquine (Plaquenil ) , used to treat rheumatoid arthritis and other diseases can also cause blindness.
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| − | symptoms
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| − | Symptoms vary from person to person , but may include:
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| − | [url=http://www.informacionopticas.com/daltonismo-tipos-e-informacion/]Daltonismo[/url] | + | |
| − | Trouble seeing colors and the brightness in the usual way .
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| − | Inability to tell the difference between shades of the same color or similar colors.
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