This optical illusion challenges your eyesight by asking you to find the odd hand out of several showing the same sign within 7 seconds. It aims to boost your concentration and sharpen your observation skills by making you notice tiny details faster. This optical illusion challenges your eyesight by asking you to find the odd hand out of several showing the same sign within 7 seconds. It aims to boost your concentration and sharpen your observation skills by making you notice tiny details faster. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle
