the blink rate does go down. >> reporter: peter johnson found wearing reading glasses telling the difference between the eyes and the screens. >> what's stunning is how quickly that strain disappeared. >> reporter: one more tip, check the license to make sure that there is no glare coming off your screen. they could make your vision blurry, causing you to strain harder to see what is there on the monitor. thank you for join us for 9news now at five. 9newss now at 6:00 starts right now. >> from the first local station with news in high every did -- in high definition. >>> new questions tonight about safety and security at metro. a new audit finding that metro has some serious problems, identifying hazards. way too little training for workers to avoid dangers. they have yet to update the plans to protect rail to dulles from terrorists. bruce leshan is live in tyson with a look at some