The human eye sees by light that reflected to it and stimulating the retina. The retina is a a neuro-membrane lining the inside back of the eye that made up of what are called Rods and Cones. When the eye received light the Rods can translate the light to shape an image of what you see in your brain but can not distinguish the colors. Cones in the other hand is the one responsible for processing the colors to your brain during the daylight.
Each visible color has a different wavelength that can be absorbed by a light sensitive pigment that is located in the cones. Genes are the one that contain the coding instructions for these pigments. These pigment can read the colors by their wave and translate it. So if there is something wrong in the instructor of the coding, the pigments will read a different color wave, and that what cause the color deficiency.
Color vision deficiency can be the inability to distinguish certain shades of color or in more severe cases, see colors at all. The color blindness is divided to three types:
A. Red-Green color blindness.
which is the most common type due to loss or limit function os the red photopigments.
B. Blue-yellow color blindness.
this type is less common than the red-green color blindness and it caused due the missing or loss the function of the blue photopigments.
C. Complete color blindness.
Complete color blindness is the disability to see colors at all, and it's really rare type of Color vision deficiency .
the color blindness can be diagnosis by different tests but the most common test is the Ishihara Color Test. The Ishihara test is a given circle that contains dotes that have different sizes and colors.
these dotes together are shaping a number or picture that is difficult for people withe Color vision deficiency to see.
References:
http://colorvisiontesting.com/color2.htm
http://www.mushaboomdesign.com/Pages/technical/05_06_digitalprinting.html
https://nei.nih.gov/health/color_blindness/facts_about
http://sangkrit.net/how-to-daltonize-your-web-browsing-experience-on-google-chrome/
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ReplyDeleteA concise explanation of colorblindness, Adil. Thank you for including relevant images and citations for where you found them, and links where your readers can find more information about colorblindness.
ReplyDeleteThe two things that are lacking from this post are 1) an understanding of why you are writing about it (What about the topic captured your interest? Why is it important for your readers — members of the general public — to learn about this topic?), and 2) what about colorblindness you will be discussing over the course of the semester.
Please consider the following in your future posts:
Please double-check your posts (or ask a peer to) for any spelling or grammatical errors (e.g., proper capitalization, punctuation) before publishing them. Don’t rely on spellcheck; I see a couple of errors that would not have been picked up by an automatic spellchecker.
You did fine this time, but so as to not run afoul of copyright laws, I recommend using creativecommons.org (https://search.creativecommons.org/) to search for images.
Prof. Ulrich
Adil, you got great images which explain very well the concept of color blindness.
ReplyDeleteI’m wondering under what category can we list colorblindness?
Is it an illness, disease, disability?
Realized that I commented on your Chapter 2 last week and not your Chapter 1, sorry about that. Regardless, these images are extremely interesting! I love that you incorporated a lot of them so it can help better explain your topic. I know this topic is one you of all people know most about. I remember having Biology Lab with you and helping you with the microscope. I can not imagine how much tougher this field of work is for you seeing as how a lot of things in science has to do with colors! Looking forward to see what article you have to critique for this week.
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