thats why ...straining in the dark, and then squinting into phone...staring for too long...give ur eyes rest lol ...u will see the difference ...ur eye collects light during the day to use when in dark but if u do it continuously u r straining the eye ...it can only focus soo muchi hardly watch tv but phone yes.. i am on BB most of the time when i am on bed.. n read updates from that.. mostly at night.. lights off cos areeb is sleeping..