Optical illusion eye tests can look annoying but are highly engaging and effective for better overall cognitive growth. In today’s task, you need to find the hidden number 280 amongst all the 208s but under a strict time frame of 8 seconds. Optical illusion eye tests can look annoying but are highly engaging and effective for better overall cognitive growth. In today’s task, you need to find the hidden number 280 amongst all the 208s but under a strict time frame of 8 seconds. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle