good interior lighting facilitates the performance of daily activities (adl) of the visually...
TRANSCRIPT
Good interior lighting facilitates the performance of daily
activities (ADL)
of the visually impaired elderly in their
homes
York, June 23th
Frouck de Boer, Occupational Therapist, the Netherlands
Overview
Visual functioning of the elderly
Experience the need of light
Recommendations for lighting design
Case study elderly home ‘Bernardus’
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Introduction
Light has a positive influence on the quality of life of the elderly
Usually:High focus on impairments, participation and activity, not on the environment
25% of the elderly residents are visually impaired
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Visual Functioning
The aging eye needs more and more light
Elderly adapt to a changing environment instead of the environment is being adapted to the elderly
Why?
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Common things elderly say
“I am not able to read the newspaper anymore”
“I bumped into the table”
“I can’t prepare dinner anymore, without making a mess of the kitchen”
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ICF model
Health Condition(disorder/disease)
Body Function
and Structure
(Impairment)
Activities
(Limitation)
Participation
(Restriction)
Environmental
Factors
Personal
Factors
Contextual Factors
Quality of life
Visual impairment can lead to reduced participation in activities of daily living and mobility
Safety – safety in their environment
Participating in activities of daily living
Independency
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Visual functioning of the elderly
The diameter of the pupil, the light transmission of the lens of the eye and the quality of the retina decreases with age.
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How many lux do you think
there is in the next room?
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Elderly, what do they see?
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Relationship between light and age
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At ages above 50,
the required
illumination level is
higher.
Increase can reach
a factor of 10 in the
70’s or 80’s!
10 20 30 40 50 60
Age in years
Reflection / Glare
refl
ect
ion
light
Part of the light absorbs
Light from a light source
reflects on an object.
Part of the light is absorbed.
This part is converted into
heat.
The rest of the light is
reflected.
If this reflected light reaches
our eyes, we see the object.
Glare / Straylight
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Source; T. v.d. Berg (VU, Netherlands)
Example of Glare
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General recommendations
Use natural light whenever possible Areas where elderly stay for a longer
time need a combination of daylight and artificial light around 1000 lux
Use indirect light (uplight) for general light and direct light for task light.
Avoid reflections Avoid big contrast differences dimmable lighting increases flexibility
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Recommendations for lighting design
General Activity
Living room 200 – 300 lux 500 – 1000 lux
Kitchen 300 – 500 lux 1000 lux
Bed room 300 lux 1000 lux
Bath room / toilet 200 lux
Corridor 300 lux
Stairs 200 lux
Orientation night 5 lux
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Case study elderly home,Royal Dutch Visio
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Message!
The physical environment of the older generation is underexposed!
There is a lack of standards for lighting specifically, for the elderly
We need to come together to assist government regulators developing strategies
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Discussion
How are the light conditions in the living environment of the elderly in your country?
What do we need in the future?
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