Yuki : My head and eyes hurt...is this because I've kept worked with computer for long time?
Frog : did you work that long?
I did stretch, take a rest, sleep a lot, eye exercises and having massage... but it's still aching!
Nyankichi Sensei : isn't it Asthenopia!?
What is Asthenopia? 'It is an ophthalmological condition that manifests itself through nonspecific symptoms such as fatigue, pain in or around the eyes, blurred vision, headache and occasional double vision. Symptoms often occur after reading, computer work, or other close activities that involve tedious visual tasks.' from wikipedia
continue to tomorrow.