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Enhancing Elderly Visual Functioning Through Interior Lighting Design

Learn how good interior lighting improves daily activities of visually impaired elderly. Overview on visual functioning, recommendations for lighting design, and a case study on 'Bernardus' home. Understand the importance of light in elder care.

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Enhancing Elderly Visual Functioning Through Interior Lighting Design

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  1. Good interior lighting facilitates the performance of daily activities (ADL) of the visually impaired elderly in their homes Frouck de Boer, Occupational Therapist, the Netherlands

  2. Overview • Visual functioning of the elderly • Experience the need of light • Recommendations for lighting design • Case study elderly home ‘Bernardus’

  3. 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

  4. 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?

  5. 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”

  6. Activities (Limitation) Participation (Restriction) Body Function and Structure (Impairment) Environmental Factors Personal Factors ICF model Health Condition (disorder/disease) Contextual Factors

  7. Quality of life Visual impairmentcan lead toreducedparticipation in activities of daily living andmobility • Safety – safety in their environment • Participating in activities of daily living • Independency

  8. 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.

  9. How many lux do you think there is in the next room?

  10. Elderly, what do they see?

  11. Relationship between light and age 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

  12. Reflection / Glare • 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. reflection light Part of the light absorbs

  13. Glare / Straylight Source; T. v.d. Berg (VU, Netherlands)

  14. Example of Glare

  15. 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

  16. Recommendations for lighting design

  17. Case study elderly home,Royal Dutch Visio

  18. Message! The physical environment of the oldergeneration is underexposed! There is a lack of standardsforlightingspecifically, for the elderly We needtocometogetherto assist government regulators developingstrategies

  19. 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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