Lighting for the Aging Eye
As we age, natural physical changes of the human eye diminish our visual abilities
including our ability to read.
The cornea becomes more opaque, the lens absorbs more light, and the pupil
diameter decreases, resulting in a reduction in retinal illuminance. Increased fat
deposits in the cornea and lens lead to an increase in light scattering inside the eye,
making it more difficult for the eye to recognize the visual images. The lens yellows
and absorbs a higher amount of blue wavelengths. Last but not least, weaker ciliary
muscles and an increased rigidity and hardening of the lens reduce our ability to focus
and to adjust to different light levels easily.
Holtkötter has initiated and supported research at the University of Colorado at
Boulder to study and develop the scientific basis of lighting for the aging eye and to
research how good lighting can mitigate the effects of the natural physical changes
that we all are subjected to as time passes. Some of the results of this study are being
incorporated into this series of table, chair-side and floor reading lamps.
The reduction in retinal illuminance requires a light level of more than 100 footcandles
for optimal reading performance. The 75-Watt or 100-Watt Halogen light bulb by
Osram, as well as the shape and construction of the inside of the reflector, allow for
alight level in excess of 100 footcandles. A matte glass diffuser and a reflector that
focuses the light only on the reading material will reduce glare and scattering.
Adjustable dimming controls and the adjustability of the physical reflector location
allow the light levels to be set at the optimal position, reducing the need for the eye
to adjust to different light levels.
Lighting for the Aging Eye
© Holtkötter International, Inc.
Joan Eisenberg, CMKBD, ASID
Joan is an Independent Kitchen and Bathroom Design and Training Consultant. She is both a Certified Master Kitchen and Bathroom Designer and a professional member of the American Society of Interior Designers.
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