Could I Be Color Blind?
Color Blindness: Understanding Color Vision Deficiency in Adults and Children
Updated August 2026
Have you ever disagreed with someone about whether a color is red, green, blue, or purple? For most people, it is simply a difference of opinion. But for someone with color vision deficiency, certain colors can genuinely look different or be difficult to distinguish.
Often called color blindness, color vision deficiency (CVD) affects the way a person sees and distinguishes certain colors. Despite the name, most people with color blindness can still see color. They simply perceive some colors differently.
Color vision deficiency is often inherited and may be present from birth. Because children may not realize they see colors differently from other people, the condition can sometimes go unnoticed until school activities or other everyday tasks make the differences more apparent.
Summary
Color blindness, or color vision deficiency, occurs when the eye has difficulty distinguishing certain colors. Red-green color vision deficiency is the most common form, while blue-yellow deficiencies and complete color blindness are much less common.
Most cases are inherited, but changes in color vision can also develop later in life because of certain eye diseases, health conditions, medications, injuries, or age-related changes.
A comprehensive eye examination can help determine whether a child or adult has a color vision deficiency and identify whether additional evaluation may be needed
What You’ll Learn
In this article, we’ll explain:
- What color blindness is and how color vision works
- The most common types of color vision deficiency
- Signs parents may notice in children
- What causes color vision deficiencies
- How color blindness can affect everyday activities
- How color vision is tested
- When a change in color perception should be evaluated by an eye doctor
What Is Color Blindness?
Color vision begins in the retina, the light-sensitive tissue at the back of the eye.
The retina contains specialized cells called rods and cones. Rods are especially important for seeing in low-light conditions, while cones help us see fine detail and perceive color.
Most people have three types of cone cells that respond to different ranges of light commonly associated with red, green, and blue. The brain combines the signals from these cones to create the wide range of colors we see.
Color vision deficiency occurs when one or more types of cone cells are missing, do not function normally, or respond differently to light.
What Are the Different Types of Color Blindness?
There are several types of color vision deficiency, and they can affect color perception differently.
Red-Green Color Vision Deficiency
Red-green color vision deficiency is the most common type. Someone with this condition may have trouble distinguishing between certain shades of red, green, brown, orange, and other related colors.
Red-green deficiencies include:
Protanomaly: Red-sensitive cones function differently than usual. Reds may appear less bright, and some red, orange, and green shades can be difficult to distinguish.
Protanopia: Red-sensitive cones do not function normally, making certain reds appear much darker and causing difficulty distinguishing red from green and related shades.
Deuteranomaly: Green-sensitive cones function differently than usual. This is one of the most common forms of inherited color vision deficiency.
Deuteranopia: Green-sensitive cones do not function normally, making it more difficult to distinguish certain reds, greens, browns, and yellows.
Blue-Yellow Color Vision Deficiency
Blue-yellow color vision deficiencies are much less common. People with these conditions can have difficulty distinguishing certain combinations of blue and green or yellow and red.
They include:
Tritanomaly: Blue-sensitive cones do not function normally, which can make some blues and greens more difficult to distinguish.
Tritanopia: Blue-sensitive cones are absent or do not function properly, which can significantly alter the way blue, green, yellow, and violet are perceived.
Complete Color Blindness
Complete or nearly complete inability to perceive color is rare.
One form, called achromatopsia, can cause greatly reduced or absent color vision along with other visual symptoms, such as sensitivity to bright light and reduced visual acuity.
Signs of Color Blindness in Children
Adults with color vision deficiency have often learned which colors are difficult for them to distinguish. Children, however, may have no reason to suspect that they see colors differently from their classmates or family members.
Possible signs of a color vision deficiency in a child include:
- Consistently confusing particular colors, especially reds and greens
- Difficulty identifying certain crayons, markers, or colored pencils
- Problems completing assignments that depend on color coding
- Difficulty distinguishing information on colored charts, graphs, maps, or worksheets
- Frequently choosing unexpected colors for familiar objects
- Difficulty recognizing subtle differences between similar shades
Using an unusual color when drawing does not necessarily indicate color blindness. Children are creative, and color choices alone are not enough to diagnose a vision problem.
Because children may adapt without realizing anything is unusual, color vision testing can be especially helpful when there are concerns.
What Causes Color Blindness?
Most color vision deficiencies are inherited.
The genes responsible for the most common red-green color vision deficiencies are associated with the X chromosome. This is one reason inherited red-green deficiencies occur more frequently in males.
However, not every color vision problem is inherited.
Changes in color perception can sometimes develop because of:
- Certain eye diseases
- Diseases affecting the retina or optic nerve
- Some neurological or systemic health conditions
- Eye injuries
- Certain medications
- Age-related changes in the eye
A color vision change that develops suddenly or later in life should be evaluated by an eye doctor, particularly if it affects only one eye or is accompanied by other changes in vision.
How Can Color Blindness Affect Everyday Life?
Many people with color vision deficiency learn to adapt and may experience few significant limitations. However, situations that rely heavily on color alone can present challenges.
These may include:
- Matching clothing
- Determining whether some foods are ripe or fully cooked
- Reading color-coded charts, maps, graphs, or presentations
- Distinguishing colored indicator lights
- Completing school assignments that depend on color
- Using websites, apps, or software that communicate information primarily through color
- Performing certain jobs in which accurate color identification is important
Fortunately, many everyday tasks can be made easier by using labels, patterns, position, brightness, or technology instead of relying solely on color.
How Is Color Blindness Diagnosed?
Color vision testing is relatively simple and can often be performed as part of an eye examination.
One commonly recognized type of screening uses patterns made up of colored dots. A person with typical color vision may see a number or shape within the pattern that someone with a particular color vision deficiency sees differently or cannot see.
Additional testing may be used when an eye doctor needs more detailed information about the type or severity of a color vision deficiency.
Online color vision screenings can also be interesting and may identify a possible problem. However, differences in screen brightness, color settings, and display technology can affect the results. An online screening should therefore not be considered a medical diagnosis.
Can Color Blindness Be Treated?
There is currently no standard treatment that restores typical color vision for the most common inherited forms of color vision deficiency.
For many people, treatment is not necessary. Instead, understanding which colors are difficult to distinguish and learning practical strategies can make everyday tasks easier.
Some specialty glasses, filters, apps, and other technologies are designed to enhance differences between certain colors. Their effectiveness varies depending on the type and severity of the color vision deficiency, and they do not provide normal color vision or cure the underlying condition.
When a color vision problem develops because of another eye or health condition, addressing the underlying cause may sometimes help.
Understanding How You or Your Child Sees Color
Color vision deficiency usually does not prevent someone from enjoying normal vision and everyday activities. Knowing that it is present, however, can help children, parents, teachers, and adults make simple adjustments when information is communicated through color.
For children, identifying a color vision deficiency can be particularly helpful in school. Teachers can avoid relying exclusively on color-coded materials or provide labels and other visual cues when needed.
If you have noticed difficulty distinguishing colors or are concerned about your child’s color vision, Blake Bush Family Eye Care in Ardmore, Oklahoma can help.
We can evaluate color vision as part of a comprehensive eye examination and determine whether the findings are consistent with an inherited color vision deficiency or whether additional evaluation may be appropriate.
Frequently Asked Questions About Color Blindness
Is color blindness the same as seeing only black and white?
No. Most people with color blindness can see many colors. They typically have difficulty distinguishing particular colors or shades from one another. Seeing little or no color at all is much rarer.
What is the most common type of color blindness?
Red-green color vision deficiency is the most common. People with this type may have difficulty distinguishing certain reds, greens, browns, oranges, and related shades.
Is color blindness more common in males?
Yes. The most common inherited red-green color vision deficiencies are linked to genes on the X chromosome, which makes these conditions considerably more common in males.
Can children have color blindness without knowing it?
Yes. A child who has always seen colors in a particular way has no basis for knowing that other people see them differently. The condition may first become noticeable when the child encounters color-coded schoolwork or has repeated difficulty identifying particular colors.
Can color blindness develop later in life?
Yes. Although many cases are inherited and present from birth, color vision can also change because of certain eye diseases, health conditions, medications, injuries, or age-related changes. A new change in color vision should be evaluated by an eye doctor.
Can an online color blindness test diagnose the condition?
No. An online screening may suggest a possible color vision deficiency, but computer and mobile displays vary in brightness and color accuracy. An eye care professional can perform appropriate testing and provide a diagnosis.
Does color blindness affect eyesight in other ways?
The common inherited forms of red-green color vision deficiency generally affect color perception rather than visual sharpness. Some rarer conditions involving color vision can also affect visual acuity or cause sensitivity to light, which is why a comprehensive examination is important when symptoms are unusual.
About the Author
Blake Bush Family Eye Care is a leading provider of optometric services in Ardmore, Oklahoma. Our mission is to help every patient enjoy healthy, clear vision for life through advanced technology, personalized care, and genuine compassion. We provide comprehensive eye exams for all ages — starting at six months — and specialize in dry eye treatment, scleral lens fittings, and ocular disease management.
Serving Ardmore and surrounding communities, we’re committed to early detection, prevention, and customized solutions for every patient’s unique vision needs. Learn more at www.blakebushfamilyeyecare.com.
