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General Community / Online color blindness test tool
« เมื่อ: 16/05/24, 16:21:27 »
online color blind test tool. You can absolutely use it easily.
ติดต่อลงโฆษณา racingweb@gmail.com
แสดงกระทู้
ส่วนนี้จะช่วยให้คุณสามารถดูกระทู้ทั้งหมดสมาชิกนี้ โปรดทราบว่าคุณสามารถเห็นเฉพาะกระทู้ในพื้นที่ที่คุณเข้าถึงในขณะนี้
หน้า: [1]
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General Community / Completely color blind
« เมื่อ: 25/08/23, 15:41:32 »
There are different degrees of color blindness.
Some people have mild color blindness. They can see normal colors in good light but have difficulty in dim light.
In more severe cases, they cannot distinguish certain colors in any light.
The most severe form of color blindness is when everything is seen in shades of gray, which is very rare.
Color blindness usually affects both eyes equally and remains stable throughout life.
Completely color blind
You don't see any color at all, and your vision may not be clear.
There are two types:
Total cone color blind test ness: It happens when two of your three cones—red, green, or blue—don't work. When only one type of cone is active, it can be difficult to distinguish one color from another. And if one of your faulty cones is blue, your vision may not be as sharp. You may be nearsighted and experience uncontrolled eye movements. This is a condition known as nystagmus.
Total rod color blindness is the most severe form of color blindness. None of your cones have active light-sensitive pigment. As a result, the world appears to you in black, white, and gray. Bright light can hurt your eyes. You may have uncontrolled eye movements (nystagmus).
There is currently no cure for this disorder. Especially when it's hereditary.
Several methods can be used to increase the perception of color in sufferers such as:
Use a color filter based on the Bragg filter. While these lenses are effective, they are expensive, bulky, and incompatible with other types of vision correction eyeglasses.
In addition, there has been research on a rhodamine derivative incorporated in commercial contact lenses to filter out specific wavelength bands (≈545-575 nm) correcting color vision blindness. Evaluation of the biocompatibility of stained contact lenses in human corneal fibroblasts and epithelial cells revealed no toxicity and cell viability remained at 99% after 72 h. This study demonstrates the potential of dyed contact lenses in wavelength filtering and the management of color vision deficiency.
Some people have mild color blindness. They can see normal colors in good light but have difficulty in dim light.
In more severe cases, they cannot distinguish certain colors in any light.
The most severe form of color blindness is when everything is seen in shades of gray, which is very rare.
Color blindness usually affects both eyes equally and remains stable throughout life.
Completely color blind
You don't see any color at all, and your vision may not be clear.
There are two types:
Total cone color blind test ness: It happens when two of your three cones—red, green, or blue—don't work. When only one type of cone is active, it can be difficult to distinguish one color from another. And if one of your faulty cones is blue, your vision may not be as sharp. You may be nearsighted and experience uncontrolled eye movements. This is a condition known as nystagmus.
Total rod color blindness is the most severe form of color blindness. None of your cones have active light-sensitive pigment. As a result, the world appears to you in black, white, and gray. Bright light can hurt your eyes. You may have uncontrolled eye movements (nystagmus).
There is currently no cure for this disorder. Especially when it's hereditary.
Several methods can be used to increase the perception of color in sufferers such as:
Use a color filter based on the Bragg filter. While these lenses are effective, they are expensive, bulky, and incompatible with other types of vision correction eyeglasses.
In addition, there has been research on a rhodamine derivative incorporated in commercial contact lenses to filter out specific wavelength bands (≈545-575 nm) correcting color vision blindness. Evaluation of the biocompatibility of stained contact lenses in human corneal fibroblasts and epithelial cells revealed no toxicity and cell viability remained at 99% after 72 h. This study demonstrates the potential of dyed contact lenses in wavelength filtering and the management of color vision deficiency.
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General Community / Color Blindness and Who Should Take the Color Blindness Test?
« เมื่อ: 25/11/22, 10:54:37 »
Color blindness, or to be more precise, color vision (chroma) defect, is a condition in which people have difficulty distinguishing colors, which makes them unable to see one or more colors. color, or see some colors differently than normal people.
Who should take the color blindness test?
color blind test can be performed for all subjects that need accurate color recognition such as: drivers, electricians, designers, painters, technicians, marketers... color recognition. Difficulty distinguishing colors can greatly affect work. Color blindness is mainly inherited and appears at birth, so many people cannot detect themselves as colorblind.
Qualitative test for color blindness (Enchroma, Ishihara)
The most commonly used qualitative test for color blindness is the Ishihara color vision test. This method was invented and published by Japanese ophthalmologist Shinobu Ishihara in 1917.
In particular, Ishihara plate testing is a standard and highly accurate method. The Ishihara plate helps to check for red-green color blindness. The Ishihara test consists of 38 clear pictures generated by unique and multicolored random dots.
The simple test is to look at the board and say the number you see. Each plate will contain information that people with color blindness will see a different result than the average person. Based on the results, your doctor will decide what color blindness you have. Some special plates are used to diagnose color blindness in children who cannot yet read numbers or letters.
Based on the Ishihara color blindness test, the Enchroma color blindness test determines the type and degree of color blindness a person has. This is a test created by professor Shinobu Ishihara at the University of Tokyo, combined with a computer-adapted algorithm to measure the type and degree of color blindness. The test has a mode for adults and children from 5 years old, with 3 main types of color blindness: green blindness, red-green color blindness and yellow-green color blindness.
Quantitative test for color blindness
Quantitative color blindness test aims to analyze in more detail about color blindness, the patient's ability to accurately perceive colors. The most commonly used quantitative colorblind test is the Farnsworth-Munsell 100 color test.
The test consisted of 4 trays of various small plates and colors. The tester needs to arrange the color discs in ascending order of color. For accurate results, the test must be done in a place with natural light, the color discs should be replaced regularly and numbered under the base to make checking the results easier. The test helps detect color blindness and its severity.
Other methods
In addition to the above two methods, there is also an online color blindness test. The online color blindness test is a version of the Ishihara qualitative color blindness test. However, online color blindness testing causes unstable image quality which can lead to errors. Therefore, for the most accurate results, see an ophthalmologist to test for color blindness under the right light.
Who should take the color blindness test?
color blind test can be performed for all subjects that need accurate color recognition such as: drivers, electricians, designers, painters, technicians, marketers... color recognition. Difficulty distinguishing colors can greatly affect work. Color blindness is mainly inherited and appears at birth, so many people cannot detect themselves as colorblind.
Qualitative test for color blindness (Enchroma, Ishihara)
The most commonly used qualitative test for color blindness is the Ishihara color vision test. This method was invented and published by Japanese ophthalmologist Shinobu Ishihara in 1917.
In particular, Ishihara plate testing is a standard and highly accurate method. The Ishihara plate helps to check for red-green color blindness. The Ishihara test consists of 38 clear pictures generated by unique and multicolored random dots.
The simple test is to look at the board and say the number you see. Each plate will contain information that people with color blindness will see a different result than the average person. Based on the results, your doctor will decide what color blindness you have. Some special plates are used to diagnose color blindness in children who cannot yet read numbers or letters.
Based on the Ishihara color blindness test, the Enchroma color blindness test determines the type and degree of color blindness a person has. This is a test created by professor Shinobu Ishihara at the University of Tokyo, combined with a computer-adapted algorithm to measure the type and degree of color blindness. The test has a mode for adults and children from 5 years old, with 3 main types of color blindness: green blindness, red-green color blindness and yellow-green color blindness.
Quantitative test for color blindness
Quantitative color blindness test aims to analyze in more detail about color blindness, the patient's ability to accurately perceive colors. The most commonly used quantitative colorblind test is the Farnsworth-Munsell 100 color test.
The test consisted of 4 trays of various small plates and colors. The tester needs to arrange the color discs in ascending order of color. For accurate results, the test must be done in a place with natural light, the color discs should be replaced regularly and numbered under the base to make checking the results easier. The test helps detect color blindness and its severity.
Other methods
In addition to the above two methods, there is also an online color blindness test. The online color blindness test is a version of the Ishihara qualitative color blindness test. However, online color blindness testing causes unstable image quality which can lead to errors. Therefore, for the most accurate results, see an ophthalmologist to test for color blindness under the right light.
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