Retinal neurons contain molecules known as rods, which are light-sensitive molecules that help a person seeIn low light, the cones are responsible for the eye’s vision of colour because they contain a set of dyes
that allow the cells of the cones to respond to light waves in all three types short, medium and long. Disruption or loss of pigment in the cones leads to an impairment of the patient’s ability to see colours,
in a condition known as colour blindness. Colour blindness associated with red and green is the most common type of colour blindness, followed by colour blindness in blue and yellow. Some people may also have a severe kind of colour blindness
that makes them unable to see any of the colours, usually accompanied by other symptoms amblyopia or lazy eye, and pupillary pupil shaking. Severe visual impairment.
Causes of colour blindness
Congenital colour blindness is often congenital; Usually holds for color blindness on the genetic defect chromosome X, and is often transmitted from the mother to the male of their children; as the females are usually not carriers of the defective gene without infection, and can female incidence of colour blindness in case the father was colour blind in addition to carry the mother ‘s genetic defect Or get sick. As a result of this genetic nature, the statistics found that males are one in 10 males, and females are estimated to be less than one in 100 females.
Colour blindness may be acquired in some cases (Acquired Color Blindness); that is, some health conditions may make a person who is not born blind colour more likely to develop it later due to a defect in the retina or one of its nerves. This kind of colour blindness usually develops and worsens over time, and its effect differs in each eye from the other. Here are some of the most important cases that may lead to acquired colour blindness.
Incidence of certain health diseases such as diabetes, and blue water in the eye (Glaucoma), multiple sclerosis (Multiple Sclerosis), and macular degeneration (Macular Degeneration), and Alzheimer ‘s (Alzheimer Disease), and disease , Parkinson ‘s (Parkinson’s disease), and leukemia (leukemia), and anemia , sickle cell (sickle cell anemia), metabolic disorders (metabolic disease), and vascular disease (vascular disease), in addition to injuries physical (trauma). Exposure to certain chemicals, such as carbon disulphide and styrene. Take certain medications Caldigoxin, Digoxin, Phenytoin, Sildenafil, and Hydroxychloroquine used in the treatment of rheumatoid arthritis (Rheumatoid Arthritis).
The doctor usually uses a test called the Ishihara Test to diagnose colour blindness. To see numbers, a person is often blinded by colour. When colour blindness occurs in red and green, the patient usually sees the two colours convergent and tilted to
the colour brown can not distinguish between them. In the case of vision impairment only yellow and blue, the injury is usually acquired as a result of damage to the optic nerves, therefore; your doctor may recommend a colour
blindness test after some symptoms, such as poor vision or white or dark spots when you look continuously. The possibility of colour blindness can also be examined using another test called the Color Arrangement;
In fact, there is no cure for congenital or blind colour blindness, but in the case of colour blindness caused by other illnesses and health conditions, treatment of the underlying condition or modification of the medication may help.
Generally, people with colour blindness get used after a period of time to this vision disorder, and although the injury does not pose a danger to the person affected, it can affect some aspects of his life: study, eating, taking medicines properly,
and difficulty in Fill some types of jobs. Here are some steps and tips that can help you cope with colour blindness and alleviate its effects on a person’s life: School alert: If a child is blinded by colour,
parents are advised to tell the school about the injury, so as to modify the subjects if necessary to facilitate learning for the child. Family use: Any question a family member or friend about colours
when needed, such as when coordinating clothing colours or determining the nature of food intake. Attention to lighting: This is meant to choose the best types of lighting for the home, because of the importance of helping to improve
the clarity of colours and differentiate them. The use of technology means: such as the use of some of the options available in computers and electronic devices that allow ease of use, and there may be some
applications that can be downloaded to mobile devices, which can help the patient to identify colours. Use of specialised lenses and glasses: Some types of coloured lenses or glasses are placed on one or both eyes to help the person see colours and differentiate between them.