| Introduction | | | | cones is not correct then the brain is restrained |
| Color blindness in most of the individuals is always | | | | from getting the exact message related to colors. |
| an inherited trait. Since men have one X | | | | A color blinded person will see a green color leaf |
| chromosome and women two, men are more | | | | as if it were tan or gray. |
| prone to be color blind than women. Thus when a | | | | Forms of the genetic deficiency |
| man inherits the gene for the defect he becomes | | | | Genetic color blindness is the result of hereditary |
| color blind whereas a women when she inherits a | | | | disorders in the photoreceptor cells. The |
| single gene for the peculiarity will not be prone to | | | | malfunctioning of different types of cone cells |
| the color vision defect. The reason is that the | | | | results in different forms of genetic color |
| good X chromosome will control the defective | | | | deficiency. Difficulty in differentiating between the |
| gene inherited. Thus for a women to inherit the | | | | colors yellow, red and green is one type of the |
| deficiency she must acquire the defective trait | | | | deficiency and difficulty in distinguishing between |
| from both her parents. | | | | blue and yellow is yet another type of color |
| The second cause for the defective color vision is | | | | blindness. The most uncommon type is mono |
| through disease. Cataract is one of the most | | | | chromic with the sufferer seeing only a black and |
| common causes for this inherited genetic | | | | white world. |
| deficiency. Also retinal and optic nerve maladies will | | | | The color blindness resulting in difficulty to |
| also result in the deficiency. Medications like digitalis | | | | distinguish red-green color is the most common |
| taken for heart disease, quinine for malaria and | | | | kind of the genetic deficiency. This sort of |
| alcohol also ensue in color blindness. | | | | deficiency affects about 2%-6% of all men. A |
| Color blindness does not mean that the affected | | | | person may also inherit this trait which reduces his |
| individual can see only black and white, but it | | | | her capacity to distinguish between blue and |
| means that they cannot see or they have trouble | | | | yellow and the deficiency affects both men and |
| in making out the difference between some | | | | women equally. |
| colors. Test yourself with the help of this diagram. | | | | Hereditary color blindness can be inherited that is |
| Cones and color Visualization | | | | it can be present from birth, or it may start in |
| An individual's color vision is related to cones which | | | | childhood or adulthood. Hereditary color vision |
| are very small cells on the retina. The cones of | | | | deficiency may remain the same all through a |
| 'red,' 'blue' and 'green' are susceptible to colors and | | | | person's life. This depends on the mutation of the |
| combinations of them. All the three types of | | | | genes. It may also be progressive. Approximately |
| cones are required if the colors are to be | | | | 8% of males, and only 0.5% of females, are color |
| perceived properly. If the combination of the | | | | blind in some way or another. |