I asked my optometrist about this, and he told me that eye strain is the only net effect of staring at a computer screen for a long time. I'm slightly farsighted myself, and have had no damage to my vision from spending a lot of time using computers for around 14 years so far. However, my friend's mother who is nearsighted, had experienced retinal detachment which I think was related to computer use (although she's a lot older than 17 so age is probably also a factor). Ultimately it would be best to ask your doctor about your specific case.
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