Colour is one of the most pervasive qualities in our human environment and one of the qualities that humans could not live without. Colour is used to be able to allow humans to interact with; such as taking note of the colours chosen for clothes, to check the traffic lights when driving, to choose colours when painting a picture, or to be able to distinguish the food that humans eat by looking at the colour of the food. However, humans who have the capability to see colour; tend to perceive colours as a part of the everyday norm –unlike some who are incapable to note down the kinds of the colours that they see. Dalton, a chemist, has called this “colour deficiency” or “colour blindness” due to a study conducted of a man who has lost the ability
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I have seen specimens of crimson, claret and mud, which were nearly alike”. (Put citation here) Dalton’s descriptions of his own abnormal colour perceptions has led to the term “Daltonism” –to describe his own colour deficiency. However, there are an array of different types of colour deficiency. To determine this, there have been colour vision tests such as ones shown in figure 1, which is also known as Ishiara plates. In the example shown, people who have normal colour vision could see a “74” shown in 1a. But in contrast, people who have colour deficiency might see something such as the depicted in figure 1b. where “74” is not as visible compared to figure 1a. Additionally, the other way to determine whether the person has colour deficiency or not, is to use the colour-matching procedure in order to determine the minimum number of wavelengths that are needed to match any other wave length in the spectrum. The procedure, should reveal three different types of colour deficiency. (Put citation …show more content…
Secondly, a dischormat needs two wavelengths in order to match all the other wavelengths within the spectrum. An example of this is shown in example 2 (c). An anomalous trichromat needs only three wavelengths in order to match any wavelengths, similar to how a normal trichromat does. But, the anomalous trichromat is not as distinct as a trichromat at determining within the wavelengths which are close together. (Put Citation
I have seen specimens of crimson, claret and mud, which were nearly alike”. (Put citation here) Dalton’s descriptions of his own abnormal colour perceptions has led to the term “Daltonism” –to describe his own colour deficiency. However, there are an array of different types of colour deficiency. To determine this, there have been colour vision tests such as ones shown in figure 1, which is also known as Ishiara plates. In the example shown, people who have normal colour vision could see a “74” shown in 1a. But in contrast, people who have colour deficiency might see something such as the depicted in figure 1b. where “74” is not as visible compared to figure 1a. Additionally, the other way to determine whether the person has colour deficiency or not, is to use the colour-matching procedure in order to determine the minimum number of wavelengths that are needed to match any other wave length in the spectrum. The procedure, should reveal three different types of colour deficiency. (Put citation …show more content…
Secondly, a dischormat needs two wavelengths in order to match all the other wavelengths within the spectrum. An example of this is shown in example 2 (c). An anomalous trichromat needs only three wavelengths in order to match any wavelengths, similar to how a normal trichromat does. But, the anomalous trichromat is not as distinct as a trichromat at determining within the wavelengths which are close together. (Put Citation