Have your eyeglass prescription updated. Clean your glasses. Be aware that bi-focal lenses can distort your vision perception. When your head is tilted up to reach for an item on a shelf, brace yourself for slight dizziness. Stand with your feet apart, and try to keep one hand free to help you keep your balance.
Shadows can distort distances.
Use multiple sources of light in each room to reduce shadows and to diffuse light. Use drapes or shades to keep the bright sun from glaring into the home. Falls on stairwells are common. Wear solid sole, flat shoes that can be held on firmly. Slippers, high heels and untied shoes can cause or contribute to a fall.