Make sure the surface is even and free of obstacles. Interference from background noise can result in a misinterpretation of directions or prescription. The client nods his head in mock approval when in actually he doesn't understand what is being said. Minimize interference by turning off the background music, get the person's attention before speaking, face the person as you speak, rephrase sentences to provide additional cues, and query the client to ensure that directions are understood. Otherwise, staff may spend the better part of their day helping clients in and out of chairs.
Tile is a problem because the surface is often slippery and uneven, throwing the elder off balance.
Older eyes need three times more light to see objects clearly. Keep the wattage up. Use indirect lighting to cut down on glare. The glare of direct sunlight is distracting and uncomfortable. Keep your client's back to the window.