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It hasn't been proved that eyestrain causes vision loss.
Folk wisdom (and early optologists) vehemently claim it does, but their common-sense thinking of "if it hurts you a little, it'll damage you over time" runs rather counter to the way the body typically works.
By that thinking, excercise that leaves your body aching and your lungs burning should be very bad for you. Indeed, it's obviously the other way around. Eyestrain is just as much excercise for your eyes as is sprinting a mile.
The factor that really determines whether a stressor on your body causes harm or benefit is mostly how steady and consistent it is. If you work your body at the same rate for hours a day and for years, your body will indeed deteriorate faster. But if you stress it irregularly, the benefits will far outweight the costs.
It's all about the body being lazy and not taking care of itself when it feels like it doesn't really have to. Don't encourage that laziness by "protecting" your eyes like a bad mother.
So, if you want strong eyes, sometimes take breaks and sometimes really strain them.
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