A certificate of not being color blind is generally required to complete administrative documents for several purposes. To be able to get it, you must first undergo a color blindness test.
Table of Content
1. How do I get a certificate of not being color blind?
2. What is color blindness?
3. Characteristics of color blindness
A certificate of not being color blind is generally required as a condition for applying for a job or continuing a job, including when you apply for the civil servant candidate test (CPNS).
To be able to get a certificate of not being color blind, you can ask for it at the nearest hospital, clinic, or health center. As a procedure, you will be asked to undergo a partial color blindness test, a medical examination procedure to determine the eye’s ability to see and distinguish colors well.
How do I get a color-blind certificate?
To be able to obtain a certificate of not being color blind, you must first undergo a color blindness test to ensure eye health conditions. Generally, the examination carried out is a color-blind test, which consists of the Ishihara test and color preparation. According To DoctorEyeHealth The Ishihara Color Blind Test (Are You Colorblind?)
1. Tes Ishihara
The Ishihara test is a common partial color blindness test. In the process, the doctor will ask you to point to numbers or letters that are vaguely listed on the image with a pattern of colored dots.
After pointing with the condition of seeing using both eyes, next, the doctor will ask you to close one eye and read and guess the picture consisting of colored dots with different numbers or shapes in the middle.
People who are not color blind can guess the number hidden in the pattern of colored dots. Meanwhile, if it turns out that you have vision problems in the form of color blindness, you will see numbers that are different from individuals with normal vision.
In addition to numbers and letters, the doctor will also ask you to trace certain color lines using your finger in the image provided. The Isihara test was first discovered by an ophthalmologist from Japan, Shinobu Ishihara in 1917.
2. Tes Holmgren dan Anomaloscope
In addition to the Ishihara test which is commonly used to request a certificate of not being color blind, there is the Holmgren test and the Anoaloscope.
The Holmgren test or colored wool yarn test is a partial color blindness test that is tested with specially designed colored wool yarns. While undergoing the Holmgren test, you will be asked to pick up a thread of the color instructed.
Meanwhile, the Anomaloscope test is carried out by guessing the color in a microscope-like instrument called the Anomaloscope.
What is color blindness?
Color blindness is a visual disorder that causes a person to be unable to see or distinguish certain colors. There are two types of color blindness, namely partial or partial color blindness, and total color blindness.
1. Partial color blindness
Individuals with partial color blindness cannot distinguish certain colors well. For example, it is difficult to tell the difference between blue and yellow.
Partial color blindness is divided into two types and each has different symptoms.
red-green color blindness
Red-green color blindness is the most common type of partial color blindness experienced by color blind people. There are several types of red-green color blindness, namely protanopia, protanomaly, deuteranomaly, and deuteranopia.
- Protanopia:
This type of partial color blindness occurs when a person perceives red to be black. People with protanopia color blindness will also see an orange-green color to yellow. - Protanomaly: Protanomaly
sufferers will see the colors orange, yellow, and red, turning green. The visible green color is also not as bright as the original color. - Deuteranomaly:
People with deuteranomaly will see green and yellow colors like red. Sufferers also have difficulty distinguishing between purple and blue. - Deuteranopia:
This condition causes the sufferer to see green to beige, and red to yellow-brown.
Blue-yellow color blind
Blue-yellow color blindness is a rare type of partial color blindness compared to red-green color blindness. There are 2 types of blue-yellow color blindness, namely tritanomaly and tritanopia.
- Tritanomaly:
Individuals with the tritanomaly condition will notice the blue color turning greener. This condition also makes it difficult for sufferers to distinguish between red and yellow. - Tritanopia:
This type of partial color blindness causes the sufferer to see blue like green, purple like red, and yellow like pink.
2. Total color blindness
People with total color blindness are unable to distinguish colors at all, which is also known as monochromatism. All things seen were only shades of grey, white and black.
Characteristics of color blindness
It is important for you to anticipate color blindness in yourself, your child and those closest to you. The characteristics of people with color blindness are having a different perception of color, and not being able to distinguish certain colors.
Color blindness is usually characterized by difficulty in naming colors since childhood, in contrast to their peers who are able to identify colors easily.
Some characteristics of individuals with color blindness, including:
1. Difficult to follow lessons at school related to color
2. Difficult to distinguish the color of raw and cooked meat
3. Difficult to distinguish the color of traffic lights