Astigmatism, Development Delay. Drops?

Hi, My son is around 3 years old and has a development delay. For a few weeks we have noticed that he put pressure on one corner of the eye with finger and then moved his both eyes to one corner and focused on objects which are little far. We visited the paediatric ophthalmologist today and he told us there is refractive error in both eyes and the dilated eye exam needs to be done after that he will be prescribed the number. Also, My kid had Dengue Shock Syndrome when he was 4-5 months old. How much do we need to worry about refractive error issues? Does he need to wear spect's lifetime? Does Dengue Shoch Syndrome have anything to do with this refractive error or my child's development delay? Also, he has some redness in the eyes, so the doctor prescribed moxicip d, moxicip, pataone eye drops for one week. Are these safe? And Does both adults and children both have the same drops?