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Lighting for Older Eyes

November 1, 2003
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Interview with Margaret P. Calkins, PhD
Lighting for Older Eyes

INTERVIEW WITH MARGARET P. CALKINS, PHD What do your residents see when they walk around the facility? To self-test your lighting, try wearing a pair of sunglasses smeared with a little petroleum jelly or lip balm. Spend three hours walking around or, even better, sitting in a wheelchair. Experience the environment as your residents do. Is there glare? Do you have difficulty recognizing faces or reading signs? Do you get a headache or tired eyes? If so, your lighting probably needs to be updated. Remember that you only spent three hours doing this-imagine what it is like for your residents. Recently, noted long-term care designer Margaret P. Calkins, PhD, president of I.D.E.A.S., Inc., and board chair of the IDEAS Institute, offered practical recommendations on lighting improvement in an interview with Nursing Homes/Long Term Care Management. Why do you feel that lighting is such an important quality-of-life issue in long-term care settings?

Dr. Calkins: As people age, changes in vision occur that affect the ability to perceive and understand the world around them. For instance, there are normal age-related changes in the pupils (less light can enter the eye), the eyes' accommodation speed decreases (it takes longer for eyes to transition to different light levels), and color perception weakens (yellowing of the lens makes it difficult to distinguish greens from blues). Older eyes also become more sensitive to glare-both direct glare (from a directly visible lighting source, such as an unshielded bulb) and indirect glare (a consequence of bright light bouncing off reflective surfaces, such as shiny floors). Compounding the problem is that many older adults develop diseases such as glaucoma, macular degeneration, and cataracts.

So much information about our surroundings comes directly from vision. I recently heard a surgeon relate a conversation he had with a patient. When he advised her to leave her eyeglasses at home, she said, "I need my glasses to hear you. I look at your face and your mouth when you speak, and then I can understand what you say to me."

How can facility lighting compensate for visual deficiency?

Dr. Calkins: On the most basic level, the goal of lighting design for older adults is to increase foot-candles, which are units of illumination on a surface, without increasing glare. An excellent way to accomplish this when ceiling heights are sufficient (generally a minimum of 8'6", preferably 9', for indirect lighting) is through cove or indirect light that is bounced off the ceiling. This indirect lighting provides even, low-glare illumination. However, because the ceiling absorbs some of this light, it requires more foot-candles to achieve adequate lighting.

It is also important that bulbs meet the appropriate Color Rendering Index (CRI), so that colors appear natural (i.e., as they are seen in sunlight). For a long time fluorescents have been the only color-correct, energy-efficient alternative to expensive incandescent bulbs. Now color-correct metal halide bulbs are available. These bulbs provide cost-savings because of their long life and energy efficiency. They often take up to five minutes to "warm up" to achieve full light output. The benefit of this is that the eyes, especially older eyes, have an opportunity to gradually adjust to the light level.

What areas of a facility can most often be identified as in need of improved lighting?

Dr. Calkins: These areas vary from facility to facility. Common problem areas include hallways where ceiling lights are set too far apart, creating deceptive alternating light/dark patterns as a person walks down the hall. Poorly lit dining rooms can result in insufficient nutritional intake and a variety of other consequences, simply because residents cannot see their food. We recently conducted a research project in which the dining room provided only five foot-candles of light at the table, which is well below the 50 foot-candle recommendation. It's no wonder that all the residents in this facility need assistance with eating.

Transitional areas also present lighting challenges for older people. On a bright day, a person entering the building from outdoors might have to stop and wait up to 90 seconds for his or her eyes to adjust to the lower light levels indoors. Bathrooms and treatment rooms also need to have appropriate lighting because in these areas people frequently change body positions and need to navigate safely.

Proper lighting doesn't concern only residents, does it? What recommendations do you have to improve light levels for staff and other building visitors?

Dr. Calkins: Because of the close visual work that staff do, proper task lighting that removes glare can improve their concentration, make their tasks easier, and keep them from becoming overtired. Increasingly, care records are being computerized, so paying attention to light sources in relation to computer screens is important. Staff retreat rooms are generally an afterthought, but with nationwide staffing shortages, paying attention to such details as lighting in these areas can help show staff that they are valuable and that the organization cares about their needs.

The residents, meanwhile, are not the only older people in the facility. Often, their visitors are well on in years, and it is important to address lighting in parking areas, walkways, and lobbies. Chandeliers with clear glass, exposed bulbs should be avoided.

What new technologies have been applied to long-term care lighting?