According to the 2019 Statistical Chart of Visual Disorders for Men and Women, the prevalence of congenital colour blindness is significantly higher in men than in women. Of the many types of visual impairment, red-green colour blindness is the most and most common. Caucasians, among others, are more likely to develop red-green colour blindness compared to Asians and Africans.
The prevalence of red-green colour blindness in Asians is about 5% in males and 0.25% in females; in Caucasians it is about 8% in males and 0.64% in females.
In other words, approximately 1 in 10 people worldwide may be suffering from colour vision disorder.
Thus, there are an estimated 300 million people in the world with colour vision disorders.
One in 12 men is colour blind (8%).
One in every 200 women is colour blind (0.5%).
Background
According to the American Optometric Association, around 8 per cent of males are born with a colour vision deficiency in comparison to 0.5 per cent of females.
As a result, there are more than 350 million colourblind people in the world. This number increases every year according to the world's population growth (1.05%).
Of the 250 babies born every minute on earth and approximately 12 children with colour deficiency are born per minute.
Definition
According to the National Eye Institute, colour vision deficiency, also known as colour blindness, is a condition in which the ability to see and distinguish colours is diminished, with the inability to distinguish between colours or a particular colour in the natural spectrum.
Research:
Normal colour vision:
The human eye recognises thousands of colours, relying on the cone cells in the retina. They can be subdivided into three types, which perceive long-wavelength light (600-780mm) dominated by red, medium wavelength light (500 530nm) in green and short-wavelength light (400-450nm) in blue.
When different colours of light stimulate the retina, they cause different levels of excitation in the various types of cone cells, which convert the light stimuli into electrical signals that are transmitted to the brain.
Comentários