Key Takeaways
- Melanin, the pigment within the iris, dictates eye colour. Fluctuations in melanin production can result in visual shifts.
- Many infants are born with light eyes that darken as pigmentation develops, with colour typically stabilizing by age 6.
- While subtle shifts can occur due to aging, significant colour changes in adults are uncommon and often warrant a professional review.
- Certain medications, ocular trauma, and specific medical conditions can influence iris pigmentation.
- Coloured contact lenses should only be obtained through a professional fitting to maintain corneal health and visual comfort.
While genetics provides the blueprint for your eye colour, you may notice subtle shifts over the years. Eye colour can change over time, though how much and why depends on your age, genetics, and in some cases, your health.
Understanding the biology behind these variations can help you distinguish between normal changes and developments that are worth discussing with your optometrist at Warman Eyecare.
A comprehensive eye exam helps rule out underlying concerns and get a clear, accurate picture of your eye health.
How Eye Colour Works
Your eye colour is determined by melanin, the same pigment responsible for the colour of your skin and hair. This pigment resides in the iris, the coloured ring surrounding your pupil. A higher concentration of melanin results in darker shades like brown or hazel, while lower levels produce lighter hues like blue or green. Your genetic makeup dictates your baseline melanin levels, but these levels aren’t always static throughout your life.
Development in Childhood
Many infants are born with blue or grey eyes, even if both parents have darker features. This happens because the iris hasn’t yet finished its developmental process. Over the first months of life, pigment accumulates in the iris, frequently causing light newborn eyes to darken.
For most children, this pigmentation process settles around age 1, but subtle changes can continue until 3 years old, and in rare cases, up to 6 years old. If you notice rapid changes or an asymmetry in your child’s eye colour, we invite you to bring it up during their next routine eye exam at our clinic.
Can Adult Eye Colour Change?
Significant changes in adult eye colour are rare. Often, what appears to be a change in colour is actually your eyes reacting to external factors:
- Lighting and environment: Variations in ambient light, clothing colours, or background hues can alter how your iris reflects light.
- Pupillary response: When your pupils expand in dim settings, the visible portion of the iris decreases, which can change the overall impression of your eye colour.
- Gradual aging: Over several decades, some adults experience a subtle lightening of the iris due to a natural shift in melanin.
Routine adult eye exams are essential for tracking these changes and monitoring your overall eye health.
Medical Factors Influencing Pigmentation
In some instances, a noticeable change in the colour of one eye or a specific section of the iris indicates an underlying condition that deserves attention:
- Inflammatory conditions: Conditions such as Fuchs heterochromic iridocyclitis may cause localized pigment loss.
- Pigment dispersion: A clinical syndrome where pigment granules scatter within the eye, potentially lightening areas of the iris.
- Pharmaceutical effects: Certain glaucoma medications, such as prostaglandin analogs, are known to cause the long-term darkening of iris tissue.
- Ocular trauma: Injury to the eye can disrupt normal iris function and pigmentation.
- Neurological factors: Horner’s syndrome is a known cause of reduced iris pigmentation on the affected side.
If you observe an unexplained change, especially if it occurs in only one eye, please schedule an appointment. Our team can help identify the cause and protect your eye health.
Exploring Coloured Contact Lenses
If you’re curious about changing your appearance temporarily, prescription coloured contact lenses are the safest route. Please avoid purchasing over-the-counter cosmetic lenses, as these often lack proper sizing and can lead to corneal scratches, infections, and discomfort.
A professional contact lens fitting at Warman Eyecare confirms the right size, base curve, and prescription for your eyes. Because contact lens parameters differ from those of eyeglasses, a separate fitting is always needed before ordering lenses. We’re here to walk you through your options and help you find a lens that works for your eyes and your lifestyle.
Clear Answers for Your Eye Health
Whether you have noticed a subtle change in your iris or are curious about exploring coloured contact lenses, our team at Warman Eyecare is here to provide clarity. We take the time to understand your unique needs, helping you distinguish between natural variations and changes that may require a closer look.
Book an appointment for an eye exam or a professional contact lens fitting to get the answers you need from a team that truly knows your eyes. We are dedicated to helping you see and feel your best.
