I just deliver a baby for 4months. I have eyestrain(2months), high myopia -6.00, -5.50), little astigma (0.25,0.50), some floater just appear sometime less sometime much. I sometime feel my less eye see better, sometime I feel my right see better than. Can this cause my power change of myopia or astigma? Any tip to make my vision better? Such as Vitamine, food, or eye exceries. Why rub eyes shouldn't do? What are tip to use iPad in safety way?