What it is
Red green color blindness is a type of color vision deficiency in which the eye's red-sensing or green-sensing cones work differently than usual. As a result, certain shades that look distinct to many people can look similar or muted. The term "color blind" is a bit misleading, since most people with this condition do see color, just not in the same way.
It is generally grouped into two families: protan types, which involve the red-sensing cones, and deutan types, which involve the green-sensing cones. Each can range from mild to more significant, and two people with the same label may experience colors quite differently.
Red green color blindness is usually inherited and is more common in men than in women. Some people also develop color vision changes later in life for other reasons, which is why an evaluation can be useful for understanding the cause.
How it’s traditionally been approached
Color vision has long been checked with screening tools such as pseudo-isochromatic plates, which are patterns of dots that hide numbers or shapes. These are often used as a first look and can suggest whether a color vision deficiency may be present.
More detailed testing, such as color arrangement tasks or an instrument called an anomaloscope, has traditionally been used to help identify the type and severity. A clinician may choose among these based on your situation.
Day to day, many people adapt with practical strategies, such as labeling items, using color-name apps, relying on brightness or position cues, and choosing accessible design settings on devices. Some people also try color-enhancing filter glasses or contact lenses. These do not cure color blindness and do not restore normal color vision, and how well they work varies with a person's specific type (protan, deutan or tritan) and severity. Glasses or lenses of this kind are not right for everyone, so it is worth asking a provider about them.
How the right doctor may help
The right provider, such as an eye doctor with experience in color vision, may help you learn whether you have a color vision deficiency, which type it appears to be, and how significant it is. A visit generally begins with a conversation about your history and any family history, followed by an eye exam and color vision tests.
Because a clinician decides what is appropriate after an evaluation, it can help to arrive with questions. You might ask which tests are being used and why, whether your results look inherited or possibly acquired, and what the findings mean for school, work or hobbies.
You can also ask whether color-enhancing glasses or lenses might make sense for you, what they can and cannot do, and what their regulatory status is. If you have a job or license with color vision standards, confirm the current requirements directly with the employer, licensing body or agency, since they vary and change over time.
The whole-person view
Body, mind and stress affect each other, and that includes how we feel about a difference like color vision. Some people feel frustrated, embarrassed or anxious when colors cause confusion at school, work or in daily tasks, and that stress can shape how they experience the whole day. Others find that simply having a name and an explanation brings relief.
If the emotional side feels heavy, support can come from several directions. Somatic Experiences offers body-based support for people who want to work with how stress shows up physically, and Therapists.plus can connect you with talk therapy for worries, self-image or coping. Neither replaces an eye exam, and both are simply options to explore.
Keep in mind
- This page is educational only and is not medical advice, a diagnosis or a treatment plan.
- Color-enhancing filter glasses and contact lenses do not cure color blindness or restore normal color vision, and results vary by type and severity.
- Only a licensed clinician can decide what is appropriate for you after an evaluation, so licensed professionals should guide your care.
- Sudden changes in vision or eyesight are worth prompt attention; for emergencies call 911, and in a crisis call or text 988.
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Frequently asked questions
What is red green color blindness?
Red green color blindness is a color vision deficiency that makes certain reds, greens, browns and oranges harder to tell apart. It happens when the red-sensing or green-sensing cones in the eye work differently than usual. It ranges from mild to more significant depending on the person.
Is red green color blindness the most common type?
Yes, red green color blindness is the most common form of color vision deficiency. It is more common in men than in women because of how it is usually inherited. Blue-yellow (tritan) types are generally much less common.
What is the difference between protan and deutan?
Protan types involve the red-sensing cones, while deutan types involve the green-sensing cones. Both can make red and green shades look alike, but the experience can differ, such as how bright reds appear. An eye care professional can help identify which type you may have.
Can color blind glasses fix red green color blindness?
No, color blind glasses do not cure red green color blindness or restore normal color vision. Some color-enhancing filter glasses may change how certain colors look for some people, but effectiveness varies by your specific type and severity. Ask a licensed provider whether they might be appropriate for you.
How is red green color blindness tested?
It is commonly tested with screening plates that hide numbers or shapes in colored dots, and more detailed tests can help identify the type and severity. A clinician chooses the tests based on your situation. A comprehensive color vision evaluation may give a fuller picture than an online screening.
Can red green color blindness be acquired later in life?
Yes, color vision changes can sometimes develop later due to other eye or health factors, though red green color blindness is most often inherited. If you notice a change in how you see color, it is worth having a licensed eye care provider evaluate it.
Educational resource. Colorblind Glasses shares general information and connects people with independent doctors. It is not medical advice, diagnosis or treatment. Talk with a licensed professional about your health.