Perhaps it is due to the bright light. After staying in a dim place for a long time, our eyes have to adjust to the light when walking outside. At this time, our pupil gets smaller, making our eyes feel uncomfortable and painful. Or your eyes hurt because you have overused your eyes, under such circumstances, you need to massage your eyes to relieve the discomfort or you can apply cool compresses to your eyes to soothe the pain. In your daily life, take a diet rich in vitamin A, beta carotene, antioxidant, fish oil and zinc rich foods such as livers, milk, eggs and vegetal foods like carrots, amaranth, spinaches, leek, green pepper, sweet potatoes, cucumber, cabbages, dates, salmon, krill, cod and tuna. Do some eye exercises and ensure enough rest of eyes. Wish you better soon.