The summer vacation is finally here, it has been raining today, Nick and Natalia have been neglected their eyes by watching tablet all day, watch TV in dark, and never get their eyes proper rest. That cause problems to the eyes, and now they must go to eye doctor. The doctor thinks that their eyes have serious diseases, such as allergic conjunctivitis and cataracts. If they do not perform the operation in time, they may never see the sun. The doctor now needs a surgical assistant. You are a graduate of medical school. Outstanding graduates, come and help this doctor complete the operation and save the children's eyes!