A new study links screen time of over one hour a day to increased myopia risk in children and young adults, with significant rise between 1-4 hours. Researchers advise less than one hour of daily screen exposure to mitigate nearsightedness. A new study links screen time of over one hour a day to increased myopia risk in children and young adults, with significant rise between 1-4 hours. Researchers advise less than one hour of daily screen exposure to mitigate nearsightedness. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle