You may have developed presbyopia, a condition that affects people aged 40 and above. Your eyes do not have enough focusing power because the lens inside has become less flexible. Usually, a flexible lens causes the eye to change focus from far-away objects to up-close objects. When the lens becomes less elastic, you begin to hold things farther from your eyes to see them more clearly. You may also experience eye strain, headache, and visual fatigue. It's best to consult your doctor because effective treatment is available.