Online Color Blind Test measures whether a person is color blind or not. Check color blindness causes, symptoms, types, and treatment.
Color Blindness is not a kind of blindness but a deficiency in the way one sees color. It leads to difficulty in distinguishing certain colors like red and green or blue and yellow.
Using the term Color Blindness could be misleading because most Color Blind people can see colors, but their color perception is limited to an extent, washed out, and imprecise.
The most common kind of color vision deficiency tends to cause inaccurate perception of the colors red and green, making it easy to confuse them.
Color blindness is caused when light-sensitive cells in the retina do not respond suitably to variations in light wavelengths that help people see various colors. The retina consists of two types of cells that detect light, rods and cones.
There are approximately 100 million rods in the human retina, and they are more sensitive to light but are unable to perceive color. Rods can detect only light and dark; they are susceptible to low levels of light.
There are close to 6 to 7 million cones in the human retina responsible for color vision. On the other hand, they detect color and are intensely situated near the center of one's vision. These photoreceptors exist in the central zone of the retina, called the macula.
The fovea, the macula's center, is only 0.3 mm in diameter and consists of the highest concentration of cones in the retina, making it responsible for acute color vision.
Color blindness can arise when one or more of the color cone cells are absent, fail to work or detect a different color than the usual. Severe color blindness occurs when all of the three cone cells are absent.
Mild color blindness occurs when all three cone cells are present, but one cone cell does not quite work right, detecting a different color than usual.
Hence, deficiencies in certain cones or the absence of these cones are often related to color blindness.
Color blindness can also occur due to aging, which causes damage to retinal cells over time. An injury or damage to the brain areas where vision is processed can also generate color vision deficiencies.
Certain medications, like Antipsychotic Medications, can cause changes in color vision. The antibiotic which treats tuberculosis may lead to optic nerve problems and difficulty in seeing some colors.
Besides, toxic chemicals such as styrene, present in some plastics, are linked to the loss of ability to see color.
Both parents contribute to chromosomes that determine the sex of the baby.
Mothers have an X-X pairing of chromosomes, while fathers have an X-Y pairing. When X chromosomes pairs with another X, the baby is a female. And when the X chromosomes pairs with the Y, the baby is male.
A common X-linked recessive gene is attributed to causing red-green color blindness. Males have only one X chromosome, and females have two; if a female inherits a normal X chromosome in addition to the chromosome that carries the mutation, the mutation is not displayed. As men lack a second X chromosome to override the chromosome that carries the mutation, males are believed to be at a greater risk of inheriting an X-linked mutation
Fathers with inherited red-green color blindness pass on the X-linked gene to their daughters; a son cannot receive X-linked genetic material from his father.
If a daughter inherits the color deficient gene from her father, she will only be a carrier unless her mother also happens to have the color deficient gene. If a daughter inherits the X-linked trait from both her parents, she will be a carrier and color blind.
Besides differences in the genetic makeup system, color vision defects or loss can also be caused by:
The most widespread symptom of color blindness is a vision change. It may get difficult to distinguish between traffic lights. Colors may seem less bright than before or usual. Different shades of color may all end up looking the same.
The symptoms of color blindness can vary from a scale of mild to severe. Many people face such mild symptoms that they are unaware of the color deficiency they are suffering from.
Parents may only notice a color deficiency issue with a child when they are learning colors.
The most common kinds of color blindness are usually inherited. They occur as the result of defects within the genes that help make the photopigments found in cones. Some defects tend to alter the photo pigment's sensitivity to color. Other defects can result in the complete loss of a photopigment.
Depending on the type of defect one has and the cone that gets affected, problems tend to occur with green, red, or blue color vision.
The most regular types of hereditary color blindness occur due to the loss or limited function of a cone, and the red cone is also known as Protan or Green Cone, also known as Deutran Photopigments. This kind of color blindness is referred to as Red-Green color blindness.
Red-Green color deficiency is the most common kind of color blindness.
The blue-yellow congenital abnormality is rarer than a red-green genetic abnormality. They have difficulty distinguishing between blue and green hues, as well as yellow and red hues.
It is the inability to see color; people with complete color blindness (monochromacy) don't experience color. The two types of monochromacy are:
Many tests measure color vision defects, but the most common is the Ishihara Plate Test. This test's for Red-Green color blindness. This test is most likely to be used for routine color vision screening in schools or medicals.
It contains 38 plates of circles which are created by random colored dots in two or more colors. The plates will be placed in front of the person, and they will be asked what number can be seen on the plate.
Some of the plates contain information which people with normal color vision can see. On the other hand, other plates contain information that only people with color blindness have access to.
If the person makes a certain amount of errors, they are diagnosed with color blindness. Special Plate tests have been made to diagnose young children who aren't old enough to identify numbers.
For a more detailed examination of color blindness and a person's ability to perceive colors precisely, a quantitative color blind test is required. The most popular test is the Farnsworth-Munsell 100 Hue Test, identifying and quantifying color vision issues.
This test comprises four trays that contain various small disks of varying hues. Each tray has a colored reference disk on one end. The person being tested ought to arrange the other disks within the tray to create a range of colors that depict the hue's gradual change.
For the most accurate results, the test should be administered in a viewing booth with natural daylight. It is also advised for the colored disks to be replaced at least every two years to prevent them from losing color saturation that could affect the test's outcome.
Each colored disk is given a number at the bottom, which enables scoring. The closer the match is between the test sequence and the correct sequence, the higher the accuracy of detecting the person's color perception.
In this manner, the Farnsworth-Munsell 100 Hue Test detects if the person being tested is colorblind and also helps determine the severity and type of their color blindness.
Currently, there is no known cure for Achromatopsia, a genetic disorder in which a child is born with nonfunctioning cones.
Research on gene therapy is still in progress and might lead to clinical treatments in the future. When tested on animals, gene therapy has shown potential in restoring some cone function in the retina.
Children should be checked for the need for glasses. Prescribing glasses to correct far-sightedness near-sightedness will improve the vision but do not restore normal levels of vision. Red-colored lenses help in reducing the sensitivity to light and hence enhance visual functions.
A newer device known as an Eyeborg helps people with color blindness to perceive color through sound waves. A Cyborg Antenna is a device implanted in a human skull.
The antenna consists of a wireless camera on one end of it and a wireless sound vibration implant on the other end, allowing wireless communication and transmission of images, sound, or video.
In the beginning, the person might get frequent headaches because of all the sounds they are exposed to, but they adapt to it in five weeks. The antenna uses audio vibration in the skull to report information.
Optometrists supply colored specks lenses or a single red-tint contact lens to improve discrimination of some colors. However, it can make other colors more challenging to differentiate.
Most people consist of three types of color-sensing cones in their eyes red, green, and blue. The wavelengths of light that are absorbed by these cones include overlapping regions.
Color blindness is often a result of a malfunctioning cone, which causes wavelengths to overlap even more, consequently leading to poor color discrimination.
Colorblind glasses have exclusively tinted lenses that help people with color blindness see colors more accurately; it allows them to see with accuracy and exposes them to a greater spectrum of colors.
The colorblind glasses use a filter to cut out the overlapping wavelengths, which allow for a more precise differentiation between colors, especially red and green.
Colorblind glasses also have very realistic applications, such as assisting a colorblind person in selecting clothes while matching patterns and colors. It also promotes growth in one's career as some professions, such as graphic designing and work profiles that require handling various electrical wiring colors, depend on accurate color perception.
It's common to think that the most prominent issue color blind people face is gauging the traffic lights; some states don't allow them to get a driver's license if they are color blind. But it doesn't stop at the traffic lights, and color blind people have difficulty with simple tasks that require one to differentiate between colors; matching clothes is one among them.
They can't tell if they've been sunburnt or if the meat is cooked right, flowers and fruits are not easily spotted, and they don't know if it's ripe or not. Colored maps and graphics can be tough to decipher.
Choosing a career is also challenging for colorblind people as bad color vision could pose risks and security problems in jobs that require color differentiation like an electrical engineer, train driver, airline pilot, firefighter, etc. And for these jobs passing a color blindness test is mandatory to qualify.
Check out the most common color blindness tips that will help you to change some basic habits.