Should I continue to play H.S. soccer if I have retinal tears, high myopia, and risk for retinal detachment?

If you care about your vision, it would be a good idea to stop playing soccer, or at least talk to your coach and see if you can still play while avoiding heading the ball - this is a little bit easier if you play in a defensive position. Varsity sports make almost no difference in getting accepted to a college unless you want to go to one of the US military colleges or an ivy league school.