Uncovering Red-Green Colorblindness: Diagnosis Methods and Tests

see through glasses

Red-green colorblindness is a common type of color deficiency, affecting more than 8% of males and 0.5% of females. Colorblindness may be inherited from your parents, or it may result from an eye disease or injury. Many people are unaware that they have a form of colorblindness until they try to drive at night or play sports like tennis, soccer and baseball (which require good vision). In general, men are more likely to suffer from red-green color blindness because the condition is dominant among them (i.e., only one copy is needed for symptoms to appear).

Causes and Types of Red-Green Colorblindness

Red-green colorblindness, a genetic condition, results from altered color-detecting cone cells in the retina. It has four types: deuteranomaly, deuteranopia, protanomaly, and protanopia, each affecting the perception of red and green hues differently.

Genetic factors

Red-green colorblindness is hereditary, meaning it’s passed down from parent to child. The genes that cause red-green colorblindness are located on the X chromosome and they affect how you see reds and greens differently than other people do.

If you have two copies of a defective gene (one from each parent), then you’re likely to be colorblind; however, this isn’t always true for everyone with the condition. In some cases, only one copy of the defective gene may be enough for someone to experience symptoms of red-green colorblindness–and even then not all individuals will experience these symptoms equally or at all!

Types of red green colorblind


There are four types of red green colorblindness: protanomaly, deuteranomaly, deuteranopia and protanopia. Each of these conditions has a slightly different effect on the way that you see certain colors.

The first type is called protanomaly–a condition that causes your eyes to perceive shades of red as lighter than they should be.

The second type is called deuteranomaly–a condition that causes your eyes to perceive shades of green as darker than they should be.

The third type is called deuteranopia–a complete inability to see any greens at all (it’s also known as total colorblindness).

And finally there’s protanopia–the complete inability to see any blues or violets in addition to having trouble distinguishing between reds and greens (you might notice this when looking at traffic lights).

Common Tests for Diagnosing Red-Green Colorblindness

There are a number of tests that you can use to diagnose red-green colorblindness. The most common test is the Ishihara test, which is an eye chart with circles containing numbers or shapes. Each circle has a dot that appears to be black but is actually either red or green when viewed by someone with normal vision. This test is effective because it relies on your ability to see differences between shades of grey rather than differences in color perception (i.e., what do you see if I put up two different shades of grey?).

If you’re interested in learning more about this method and other common tests for diagnosing red-green colorblindness, then keep reading!

Ishihara test

The Ishihara test is a type of colorblindness test that uses a series of colored dots to help you determine whether you are red-green colorblind. This type of test is the most common and widely used, as it requires no special equipment and can be administered by anyone who has been trained to administer it properly (e.g., teachers).

Ishihara test

The Ishihara Color Vision Test was created by Dr Shinobu Ishihara in Japan around 1916 as an easy way for doctors to determine if their patients had any form of color vision deficiency (CVD). It was later published in 1921 as “A New Way To Determine Color Blindness”.


The anomaloscope is a color vision test that uses filters to separate the different wavelengths of light. It can be used to test red-green colorblindness and blue-yellow colorblindness. The anomaloscope has two lenses: one captures blue light, while the other captures yellow (or green). When you look through both lenses at once, you’ll see several overlapping circles of varying hues; these represent different shades within each spectrum.

If you are able to identify all of these colors correctly with ease when using this device, then your vision is considered normal. If not, there’s a chance that one or more types of colorblindness may be present in your eyesight–and if so, diagnosis and treatment options will need to be discussed further by an eye care professional.

Farnsworth-Munsell 100 hue test

The Farnsworth-Munsell 100 hue test is a common color blindness test used to diagnose red-green colorblindness. It provides you with an understanding of how your eyes see different shades of color, which will help you determine if you have a form or type of color vision deficiency.

To perform this test, find yourself a quiet area where there won’t be any distractions or interruptions and set aside about 30 minutes to complete it. You’ll need some blank paper and something to write with (pencils work well). The best time for doing this is when your eyes are fresh from waking up in the morning–before caffeine kicks in!

Farnsworth-Munsell 100 hue test

Take out your sheet of paper and draw two large circles on it: one smaller than the other by at least half an hour’s worth of radius (the distance from center point C1 through C2).

Cambridge Colour Test

The Cambridge Colour Test is a simple way to determine if you are red-green colorblind. It is not meant as a substitute for an eye exam, but it can give you an idea of whether or not you have the condition and how severe it may be.

Cambridge Colour Test

To take this test, look at each picture and decide which of the two colors in each pair is most similar to its neighbor on either side:

  • If there are no errors in your answers after going through all 12 pairs (24 total images), then it’s likely that you aren’t suffering from any type of colorblindness at all! Congratulations! You’re able to see all colors perfectly well without any problems whatsoever!
  • If there were 1-3 errors per pair (6-12 total errors), then there might be some mild symptoms present but nothing too serious at this point–it’s still worth seeing an optometrist though just in case though because sometimes things like glaucoma can contribute towards making people think they’re having trouble seeing certain colors when really they’re not; other times these kinds of issues could mean that their prescription needs updating so they can see better again soon enough…

How to Perform a Red-Green Colorblindness Test at Home

If you’re interested in testing yourself for red-green colorblindness at home, there are a few things that you should know. First of all, it’s important to make sure that the test is accurate for your needs by using a chart that has been verified by experts as being effective at diagnosing red-green colorblindness. You can find this information on our website or by talking with an optometrist or ophthalmologist who specializes in vision disorders like strabismus (crossed eyes) and blepharitis (an inflammation of eyelids).

The Antern Test Chart is an easy way to test if you are colorblind or not. It consists of a sheet of paper with squares drawn on it, along with some red ink and green ink pens. You hold the flashlight above the paper so that it shines through onto another surface; if there are three circles in each square, then your vision is fine.

Online tests and mobile apps

Online tests and mobile apps are not as accurate as professional tests.

  • Some online color blindness tests are not free, while others ask for an upfront payment before you can take the test. This is a problem if you’re on a budget or don’t have access to any money at all.
  • Some apps provide limited access to their services because they’re only available in certain countries (for example: America), while others may charge extra fees if they detect that your IP address is outside of their country’s borders (e.g., UK).
  • Some apps offer only one type of diagnostic exam–the Ishihara Color Blindness Test–which doesn’t include more comprehensive assessments like those done by eye doctors using colored lenses or computerized equipment such as Sloan Kettering Medical Center’s Retinal Imager II system pictured above!

Precautions and limitations

Some of the tests on this page can be used as a diagnosis for red-green colorblindness. However, they are not 100% accurate and should not be used as a substitute for a medical examination. If you’re concerned about your eye health, it’s important to visit an optometrist or ophthalmologist who can perform a full eye exam in order to make sure that there aren’t other underlying conditions affecting your vision (like glaucoma).

The results of these tests will not provide much information about other types of vision problems such as macular degeneration or cataracts–so if you’re worried about any issues with these areas, you’ll need more than just an online test!

Visiting an Eye Care Professional

If you’re curious about your color vision, or if you suspect that you might be colorblind, visiting an eye care professional is one of the best ways to get answers. An eye doctor can help determine whether or not your vision is normal through a series of tests and examinations. If there are any problems with your eyesight or color perception, they will be able to diagnose them properly and prescribe treatment options such as glasses or contact lenses.

Visit an optometrist (or ophthalmologist) for an exam if:You are experiencing symptoms of red-green colorblindness (like difficulty seeing traffic lights).

You are having trouble with your vision in general (blurry or double vision). You have children who are experiencing difficulty with schoolwork, sports or other activities that require good color perception.

When to see a professional

If you’re concerned about your vision, or if you’ve experienced symptoms of colorblindness and want to confirm the diagnosis, it’s important to see a professional. There are several reasons why this is true:

  • If your vision has been affected by an underlying condition such as macular degeneration or diabetic retinopathy (which causes changes in the retina), it may be difficult for an optometrist or ophthalmologist to diagnose red-green colorblindness accurately just by examining your eyes. They’ll need additional tests like color vision tests and specialized exams that measure how well different parts of the retina function.
  • Because many people who are diagnosed with red-green colorblindness don’t realize they have it until later in life–and because there’s no cure for the condition–it’s important for anyone who experiences symptoms associated with red-green colorblindness (such as difficulty identifying colors) to get tested early on so they can begin learning ways around them before their condition worsens over time.

What to expect during the appointment

During your appointment, you may be asked about:

  • Your symptoms. When do you notice the colorblindness? How often does it happen? What types of situations make it worse (or better)?
  • Your family history. Does anyone in your family have a history of red-green colorblindness or other vision problems that could affect color perception?
  • Your lifestyle. What kind of work do you do and what are its demands on your eyesight (for example, hours spent staring at a computer screen or watching TV)? Do you spend a lot of time outdoors exposed to bright sunlight and/or glare from water or snow reflection? Do these conditions affect how often you wear sunglasses or other protective eyewear when outside during daylight hours–and if so, how long after exposure do they require before they can safely be removed again without causing further damage due to prolonged exposure!

Treatment Options and Coping Strategies for Red-Green Colorblindness

Corrective lenses are the most common treatment option for red-green colorblindness. They’re used to correct your vision and make it easier to see colors accurately, but they don’t change how you perceive the world.

There are two types of corrective lenses: contact lenses and glasses. Contact lenses can be made from either hard or soft materials, depending on your preferences and lifestyle needs (for example, if your job requires heavy equipment). If you wear glasses or contacts already, we recommend getting an evaluation at one of our offices before switching over entirely; there may be options available that will allow both types of corrective devices in one pair!

If none of these work for you–or if they don’t fit into your budget–there are other tools available as well: specialized software programs like Photoshop CS6’s “color range” feature; smartphone apps such as Colorblind Assistant Lite Edition (free) which convert images into black & white so users can better distinguish between shades; even games like Minecraft(R) for iOS devices($4) which allow players with color vision deficiency enjoy playing alongside those without it

Corrective lenses

Corrective lenses are the most common treatment for red-green colorblindness. They can be tinted or colored, but they’re more often made to correct for colorblindness. Multifocal lenses are also available, which means they correct both distance vision and near vision simultaneously. This is a glasses-free solution for those who want to avoid wearing glasses or contact lenses.

Contacts offer another option for people who want to avoid having to wear corrective lenses on a daily basis,They’re worn directly on the cornea and are usually made of hard or soft contact lenses. These can reduce distortion and improve vision for those who have mild to moderate colorblindness.

Tools and technology

There are a number of tools and technologies that can help you diagnose red-green colorblindness. In fact, many of these tools are available on your phone or computer right now!

  • Colorblindness apps: These apps allow users to take photos of different colors and see how they appear to people with various types of color vision deficiency. They’re great if you want to test out which type(s) might apply to you before heading into an eye doctor’s office or buying glasses online (which we’ll talk about below). Some examples include Color Blind Test HD by Color Vision Deficiency Solutions Inc., Colblindor by Google Inc., Color Blindness Tests & Exercises by Ceglowski Consulting Services LLC, and Red Green Colourblindness Test – Professional Version by Chanlea Vision Ltd..
  • Software programs: There are also software programs designed specifically for diagnosing red-green colorblindness such as iLOOK from David Hockney Ltd.. It’s based on the Farnsworth D15 test but features more advanced algorithms that allow more accurate results than traditional methods alone do; this means that even those who have never been diagnosed before can get an idea about whether they might be affected by one particular type over another (or both).

Tips for daily life

  • Use high-contrast colors. If you’re colorblind and have trouble distinguishing between red and green, try using high-contrast colors like white or black instead of shades of gray.
  • Use color-coded labels. If there are items in your home that need to be labeled (such as household chemicals), use stickers with different colored backgrounds so that people can easily tell them apart by sight alone without having to read the words written on them.
  • Use a magnifying glass when reading small print on medicine bottles or other labels if this is difficult for those with red-green colorblindness due to their inability to distinguish between certain shades of these two colors in close proximity with each other (such as brown).
  • Make sure everything’s well lit–but not too bright! Bright light can sometimes make it harder for those with red-green vision deficiencies because they’re used more often than most people realize; however, dimmer lighting conditions may lead some individuals down an entirely different path…


With this guide, you should have a better idea of how to diagnose red-green colorblindness and what steps to take next. If you’re still unsure about whether or not your child is colorblind, it’s always best to consult with an eye care professional. They will be able to run tests and offer helpful advice on how best to handle the situation at home or in school!

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