Can Colour Vision Change Later in Life?

Many people first learn about colour vision deficiency at school, during an eye test, or when a family member points out a long-standing difference. Inherited colour vision deficiency is usually present from birth and is generally stable. But colour vision can also change later in life. That distinction matters: a newly noticed change is a reason to speak with an optometrist or ophthalmologist rather than relying on an online screen alone.

This guide explains the difference between inherited and acquired changes, the practical signs to notice, and what a clinical eye examination can add.

Inherited and acquired colour-vision differences are not the same

The most common forms of colour vision deficiency are inherited. They affect the eye’s cone cells and commonly make certain reds, greens, oranges, browns, or blues harder to tell apart. These differences usually do not suddenly appear or progressively worsen. Read more about the types of colour blindness and how colour vision is inherited.

Acquired colour vision deficiency means that colour perception has changed because something is affecting the eye, the optic nerve, or the parts of the brain that process vision. It may affect one eye more than the other, change over time, or occur with other visual symptoms. Those patterns are not a diagnosis by themselves, but they are useful details to share with an eye-care professional.

Signs worth paying attention to

Not every change is easy to describe. A person may notice that a familiar object looks less vivid, two colours are unexpectedly difficult to separate, or one eye sees a colour differently from the other. Keep track of when it began and whether it is constant.

Arrange an eye examination if you notice a new or increasing problem such as:

• Colours looking less bright, washed out, or different from usual
• A difference when comparing one eye with the other
• Difficulty distinguishing colours that used to be easy to tell apart
• A change after an eye injury, surgery, illness, or new medicine
• Colour changes alongside blur, reduced side vision, double vision, or eye discomfort

If the change is sudden or occurs with severe eye pain, a red eye, flashes, a dark curtain or shadow, weakness, speech difficulty, severe headache, or other new neurological symptoms, seek urgent medical care. This list is not a way to self-diagnose; it is a reason not to wait for an online test result.

What can cause acquired changes?

An eye examination is needed to work out the cause. According to the National Eye Institute, acquired colour-vision changes can occur with conditions that affect the retina, optic nerve, or brain. Examples include eye diseases such as glaucoma or age-related macular degeneration, cataracts, neurological conditions, injuries, and some medicines. Certain chemical exposures can also affect colour vision.

That does not mean that a colour-vision change proves any one of these causes. Many eye and health problems have overlapping symptoms. The useful next step is a timely assessment, particularly if the change is new, one-sided, or progressing.

Why one-eye comparison can be useful

When it is safe and comfortable, briefly compare a familiar coloured object with each eye separately in ordinary light. A clear difference is helpful information for your clinician. Do not stare at bright lights or use this as a substitute for an examination.

Inherited red-green differences commonly affect both eyes in a similar way. A noticeable difference between eyes can be one clue that an eye-care professional will want to investigate. They may check visual acuity, the health of the eye, pupil responses, and colour vision as part of a wider assessment.

How clinicians test colour vision

Clinical testing is more controlled than viewing colours on a personal device. Depending on the question, an eye-care professional may use:

• Colour plates, which contain numbers, symbols, or paths within coloured dots
• Hue-arrangement tests, where coloured caps or tiles are placed in sequence
• Anomaloscope testing, a specialised comparison of lights in some settings

These tests help describe the pattern and severity of a colour-vision difference. They are interpreted alongside your history and eye examination, especially when symptoms are new. The National Eye Institute notes that eye doctors may use more than one test if a plate test is unclear.

Can an online colour test identify an acquired problem?

No. A browser-based activity can be an educational screen and may help you notice that a colour task is difficult, but it cannot examine your eyes or identify the reason for a change. Results can also vary with screen settings, display technology, room lighting, browser rendering, and the test conditions.

Our Ishihara-style activity, Farnsworth hue activity, and D-15 activity are designed for general information. They are not clinical instruments and should not be used for medical, licensing, employment, or legal decisions. See how to use an online colour vision test thoughtfully for practical limits and preparation.

Questions to take to an eye appointment

Writing down a few details can make an appointment more productive:

• When did the change start, and was it sudden or gradual?
• Does it affect one eye, both eyes, or only certain colours?
• Are there related symptoms, such as blur, pain, flashes, headaches, or light sensitivity?
• Have you had an eye injury, eye procedure, recent illness, or new medication?
• Is there a family history of colour vision deficiency?

Bring your usual glasses or contact lenses. Do not stop or change prescribed medication based on colour-vision concerns without speaking to the clinician who prescribed it.

The bottom line

Long-standing inherited colour vision deficiency is common and usually stable. A new, worsening, or one-sided colour-vision change is different: it calls for professional assessment, because the cause may be treatable and an online test cannot distinguish among possibilities.

Frequently asked questions

Can ageing affect colour perception?

Yes. The National Eye Institute notes that colour vision can worsen with age, including when cataracts affect the eye’s lens. Age-related change is still worth discussing during routine eye care, especially if it is noticeable or affecting daily tasks.

Does colour vision loss always mean an eye disease?

No. It can have several causes, and only an examination can determine what applies to an individual. Inherited differences are also common. The important distinction is whether the change is new or changing.

Should I test each eye separately at home?

You may notice and report a clear difference between eyes, but a home comparison is not a diagnostic test. A new one-eye difference should be discussed with an eye-care professional.