Will blurry vision heal over time?

I'm a male and almost 15. So a couple months ago i watched a show on my iphone 6 in my bed… Despite what my parents told me, i was convinced my eyes were strong they my vision was perfect. After i finished the show, the next month or so at school, the smartboard would be blurry. I got my eyes checked and i have 20/10 vision from a previous 20/20 about 6 months ago. Will my blurry vision heal if i don't watch tv/play videogames/ computer? Or do i need glasses? Thanks. Also my sight is only blurry at the distance across a small room (15ft?)

I guess you aren't aware, 20/10 is better than 20/20