Because short-sightedness is embedded in our genes. In primitive societies, survival was difficult, and people constantly faced the threat of death. As a result, the priority was to stay alive in the moment, with little capacity to think about tomorrow or the distant future. This instinctive mindset has continued to influence us over time. Today, life has changed dramatically, and most people no longer face constant threats to survival. However, this instinct still lingers. Modern environment...