Do color-blind people see in black and white?

Almost never. The overwhelming majority of people with color vision deficiency see a full range of colors but have difficulty distinguishing certain pairs, most commonly reds and greens. Complete color blindness, where the world appears in shades of grey, is a rare condition called achromatopsia.

Do color-correcting glasses cure color blindness?

No. These glasses use special filters to increase the contrast between colors that a person normally confuses, which can make some colors appear more vivid or distinct. They do not restore normal color vision, they do not work for everyone, and they are not accepted for passing occupational color vision tests.

Can color blindness stop me from getting certain jobs?

Some careers, such as commercial piloting, certain military roles, electrical work, and some transport jobs, have color vision requirements because safety depends on distinguishing colored signals. Many of these have been modernised to allow milder deficiencies. If you are considering such a career, a formal color vision assessment early on can save disappointment later.

Eye & EarICD-10: H53.5Common in men (roughly 1 in 12) and uncommon in women; mostly inherited

Color Blindness

Also known as: Color vision deficiency, Colour blindness

Color blindness, more accurately called color vision deficiency, is a reduced ability to tell certain colors apart. True inability to see any color is extremely rare; most affected people have trouble distinguishing reds and greens, and a smaller number struggle with blues and yellows. It is usually inherited and present from birth, caused by missing or altered light-sensing cone cells in the retina. Because it is passed on the X chromosome, it is far more common in men than women. Color blindness does not damage the eyes or worsen over time, but it can affect everyday tasks, schoolwork, and eligibility for some careers, so recognising it early helps people adapt.

At a Glance

Common symptoms: Difficulty telling red from green, or blue from yellow, Trouble seeing colors in dim light, Confusing shades that others see as clearly different, such as purple and blue
Main treatments: There is no cure for inherited color blindness, and most people adapt well without treatment, Treating the underlying condition when color vision loss is acquired, such as managing cataracts or changing a medication, Specially tinted glasses or contact lenses that can enhance contrast between some colors for some people
Category: Eye & Ear · Common in men (roughly 1 in 12) and uncommon in women; mostly inherited
See a doctor if: A noticeable change in how you see colors as an adult, which can signal eye or nerve disease

Symptoms

Difficulty telling red from green, or blue from yellow

Trouble seeing colors in dim light

Confusing shades that others see as clearly different, such as purple and blue

Difficulty reading color-coded charts, maps, or traffic lights

In children, trouble learning colors or coloring objects unusually

Rarely, seeing everything in shades of grey (complete color blindness), often with light sensitivity

Causes

Inherited faults in the genes that code for cone cell pigments, usually on the X chromosome
Eye diseases such as glaucoma, macular degeneration, cataracts, or diabetic retinopathy
Damage to the optic nerve or visual areas of the brain
Certain medications, including some used for heart disease, high blood pressure, and infections
Normal ageing changes in the lens, which can subtly alter color perception

Risk Factors

Being male: red-green deficiency affects roughly 1 in 12 men but only about 1 in 200 women
A family history of color vision deficiency
Northern European ancestry (for inherited forms)
Eye diseases that affect the retina or optic nerve
Long-term use of certain medications known to affect color vision

Diagnosis

Ishihara plate test: identifying numbers hidden within colored dots
Arrangement tests that ask you to order colored discs by hue
Online screening tools (useful for a first check but not a substitute for formal testing)
Eye examination if the deficiency appeared later in life, to look for an underlying cause

Treatment

There is no cure for inherited color blindness, and most people adapt well without treatment
Treating the underlying condition when color vision loss is acquired, such as managing cataracts or changing a medication
Specially tinted glasses or contact lenses that can enhance contrast between some colors for some people
Smartphone apps that identify colors or filter images
Practical adaptations: labelling clothes, learning the position of traffic lights, and using high-contrast settings on devices
Supportive: informing teachers and employers so color-coded material can be adjusted

Prevention

Inherited color blindness cannot be prevented
Have children tested early if there is a family history so school materials can be adapted
Manage conditions like diabetes and glaucoma that can damage color vision
Ask about color vision side effects when starting long-term medications
Have regular eye exams to catch acquired causes early

When to See a Doctor

A noticeable change in how you see colors as an adult, which can signal eye or nerve disease
Color vision changes along with blurred vision, eye pain, or loss of vision
Your child struggles to learn colors or mixes them up consistently
Color vision problems after starting a new medication

Frequently Asked Questions

Related Conditions

Myopia

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Cataracts

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Age-Related Macular Degeneration

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Glaucoma

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