**China Lighting Network** recently released a new technical report titled *"Lighting for Older People and People with Visual Impairment in Buildings"* (CIE-227). This report explores how environmental lighting affects visual functions such as visual acuity, contrast sensitivity, visual field, and color vision. It also provides specific lighting design recommendations for indoor spaces like offices, public areas, and facilities tailored for the elderly and those with visual impairments.
As people age beyond 45, their eyes undergo changes that impact vision. Light scattering increases, reducing spatial contrast sensitivity and retinal illuminance. Dark adaptation declines, and color vision weakens, leading to a general decline in visual performance. According to the World Health Organization (WHO), over 285 million people worldwide experienced some form of visual impairment in 2017. With the global population aging—shown in Figure 1—the need for appropriate lighting solutions for the elderly and visually impaired is becoming increasingly critical.
Previous reports, such as CIE 123-1997, addressed the effects of lighting on visual functions and provided design guidelines for low vision individuals. ANSI/IES RP-28-07 focused on lighting schemes for specific areas like elevators, corridors, bedrooms, and bathrooms. CIE 196:2011 analyzed contrast sensitivity models across different age groups, offering engineers practical solutions for lighting design.
Building on this research and current societal trends, CIE-227 introduces several key improvements:
1. **Lowering the age threshold for "elderly" from 65 to 50**, increasing lighting standards for public environments.
2. **Comprehensive analysis** of factors like illumination levels, brightness contrast, glare, and visual sensitivity, with tailored suggestions for older adults and those with visual impairments.
3. **Detailed examples** of lighting and color design strategies for various settings.
The report highlights that as people age, their sensitivity to brightness contrast decreases, but increased intraocular light scattering leads to larger images of light sources on the retina. This means that older individuals experience more discomfort from glare. As shown in Figure 2, the same light source appears significantly brighter to the elderly than to younger people.
Beyond visual function, light also has non-visual effects that influence the circadian rhythm. Factors such as light intensity, spectrum, distribution, frequency, and duration all affect mood and sleep quality. Therefore, effective lighting design for the elderly and visually impaired must consider both visual and non-visual impacts.
**Editor: Yan Zhixiang**
CT For Single-phase Electricity Meters
Our company`s current transformers have high precision,wide range,small volume and good linearity that can be used to the field of electronic watt-hour meter, electric energy metering, electronic detection.
Performance
â—Power frequency insulation strength:The insulation between the primary winding and the secondary winding and the ground part of the CT can bear 4kV power frequency voltage for 1minute
â—Interturn insulation strength:The secondary open circuit, the primary winding through the rated current 1min, no inter-turn damage in the transformer
â—The deviation is better than the industry standards and national standards
Single-Phase Electricity Meters Ct,Good Current Transformer,Common Current Transformer,Best Ct Productts
Anyang Kayo Amorphous Technology Co.,Ltd. , https://www.kayoamotech.com