The need to wear glasses is completely irrelevant to computers.
Some need glasses when they are 4 years old.
Some don't need them when they are over 60.
Trying to find reason/cause between computer screen and it causing you to possibly need glasses is same as comparing global warming to decline in pirates in caribbean sea.
Yes, global warming has been happening since 1600's and yes, amount of piracy has gone down, it must be relevant!!
Yes, poor lighting/such can cause eye strain
Yes, eye strain if you keep on doing it despite that your eyes tell you they are not having fun, can be harmful.
Some could consider it excercise for their eye muscles
(in a way, this is true)
Will it result in you having to to wear glasses in normal everyday life? it depends on your genes and eyes.