I wanna buy new prescription glasses for my son at the online optical stores, he is at the age 8 and his prescription is SPH+2.00 for left eye and SPH+1.75 for right eye. Which index lenses is suitable for my son? 1.50, 1.57, 1.61 or 1.67? Thank you in advance!

It is no need to buy high index lenses for your son as he has a mild prescription. 1.50 index lense are enough for his prescription. But as the prescription glasses are for kids, you'd better choose the polycarbonate lenses for him as they are very impact-resistant and great for active people.