Why do most elderly people need more light to read?

Most elderly people need more light to read due to age-related changes in vision, such as reduced pupil size and decreased lens clarity, which limit the amount of light that reaches the retina. Additionally, conditions like cataracts or macular degeneration can further impair their ability to see clearly in low-light conditions. As a result, brighter lighting helps enhance contrast and visibility, making reading easier and more comfortable for them.