Eye site prob not sure whats the matter

Hey it’s me again well for the past week I’ve been noticeing every now and then my eyes just blur out for a couple of minuites and I cant see but hwen I get them checked by a docter I’ve got 20/20 vision. I don’t know whats the hecks wrong with them liek soem times they last a hour some times a second like 2 sconds ago I had one and then liek 4 minuites. And I go to school and its affecting my work when I pass up my work normally I get everything right because msot of my work is easy stuff but when my vision blurs I’ve got liek 100 mistakes because when it blurres out ofr a few seconds in stead of write a you I wrute a why so I have to restart that sentence and we use pens! Its annoying not being able to see. I’ve tried everything I know of see a docter use eye drops but nothing works and it sucks a houir one has only happend once but I didnt do any work because on each subject we get only 50 minuites of work time then we go to the next and do that for homework.I desprately need jhelp any siggestiosn?