What strength computer glasses should I get?

[Copiague]

Basically, I use glasses to see things more clearly but on the computer, I'm fine with my eyes and can see clearly. I just need computer glasses. Should I get +1 strength?

[Copiah]

The strength of computer glasses depends on the prescription of the glasses you already have. There is special formula to calculate what strength you need for computer glasses . Take your prescription to the doctor and he will tell your what strength you need .

[Coplay]

NO, i don't think so. eyes are very important organs for us. So, you'd better having eye test to know your prescription. And the eye doctor will give you prescription, of course including the prescription for computer glasses. And i think this is the safe way to know your strength for computer glasses.