Designing for Aging Eyes: How Vision Changes Impact Color Use

Elderly Vision Perspective

Recent work on age‑friendly design raised the question: what does the world look like through an older person’s eyes? Based on research papers, this article analyses how aging affects light and colour perception.

Human Eye Structure

Light enters the eye through the cornea and lens, passes the pupil and reaches the retina where rods detect brightness and cones detect colour. The macula (central fovea) is the key sensor.

Light

With age the crystalline lens yellow‑s, absorbing more blue light; cataracts and glaucoma further cloud the lens, reducing overall transmittance. Consequently, older eyes receive less blue light and appear more yellow‑tinted.

The amount of light entering the eye can drop 28‑43 %, comparable to wearing sunglasses.

Pupil

The pupil’s sphincter muscle weakens with age, reducing pupil diameter to about a stable size around 60 years, which lowers the amount of light reaching the retina and makes scenes appear darker.

Colour

Colour perception relies on three types of cone cells: short‑wave (blue), medium‑wave (green) and long‑wave (red). Green cones are most numerous, red next, blue the fewest, which explains common colour‑vision deficiencies.

Because blue‑sensitive cones are scarce, designers often avoid pure blue in critical UI elements. Red‑green traffic lights favour red and green due to wavelength‑dependent diffraction; longer wavelengths travel better in fog and are more visible to aging eyes, especially when cataracts are present.

Design Recommendations for Designers

Based on the physiological findings, the following guidelines help create age‑friendly colour schemes:

Colour saturation : use moderate saturation to avoid overwhelming ageing eyes.

Single‑colour usage : for blue, choose 400‑460 nm (HSB H 211‑189); for green, use 550 nm (HSB H ≈ 82); avoid deep reds (>720 nm) as lens yellowing shifts them toward orange.

Colour combinations : balance warm and cool tones; limited blue is acceptable because excessive blue can cause visual fatigue.

Eye‑protection mode : provide a low‑brightness, high‑contrast theme to reduce strain.

Conclusion

Over 80 % of people over 60 develop cataracts, and other age‑related changes dramatically affect colour perception and brightness. Designers should consider these physiological limits to create inclusive, elder‑friendly interfaces that convey information clearly and compassionately.