What Is Color Blindness?
Color blindness, also called color vision deficiency, is a condition that affects how a person sees certain colors. Most people with color blindness are able to see colors, but some shades may look very similar or difficult to tell apart.
The condition happens when special color-detecting cells in the retina, called cones, do not work as expected. Red-green color blindness is the most common form, while blue-yellow color vision problems are less common.
Most people are born with color blindness because of inherited genetic changes that affect the cone cells in the eye. The condition is more common in men than women.
Sometimes color blindness develops later in life because of another health condition or eye problem, including:
- Glaucoma
- Macular degeneration
- Diabetic eye disease
- Multiple sclerosis
- Stroke
- Certain medicines or chemical exposures
Symptoms
Symptoms of color blindness can range from mild to more noticeable depending on the type and severity of the condition.
Common symptoms include:
- Trouble telling red and green apart
- Difficulty distinguishing blue from yellow
- Colors appearing faded or similar
- Problems identifying color-coded information
In rare cases, people may only see shades of gray and may also have reduced visual sharpness.
How Is It Diagnosed?
Eye care providers diagnose color blindness through a comprehensive eye exam and color vision testing.
Common tests use patterns made of colored dots or symbols to check how well a person can identify different colors. Additional testing may help determine the type and severity of color vision changes.
Color blindness is sometimes discovered during routine eye exams, school screenings, or job-related vision testing.
How Is It Treated?
There is currently no cure for inherited color blindness. However, many people adapt well and continue normal daily activities with simple adjustments.
Treatment and support may include:
- Special glasses or contact lenses that improve color contrast
- Organizing items by labels or patterns instead of color
- Using apps or technology that help identify colors
- Treating underlying eye or neurological conditions in acquired cases
Most people with color blindness have normal vision otherwise and learn effective ways to manage color-related challenges over time.
