Can being on the computer all day in semi-darkness cause dizzyness? I had a "funny do" earlier on - I've been on the computer more or less all day and haven't got the main light on. I felt like the page was wavering about and I felt generally light-headed. Could it be that my eyes need testing or something? (Don't laugh!!!). Could it be because they are getting worse with age? I'm 42 and haven't had them tested for yonks! I am a bit tired but not overly so. Just a bit worried and feel a bit silly asking the doctor - sounds a bit over dramatic if you know what I mean!! Any suggestions?!