Going to bring them for vision test

I am planning to bring my children to do the vision test this weekend. I am quite worry they will get my genes and have to wear spec at their young age. I am praying hard they do not have to wear at so young age now. It is really very inconvenient if wearing spec, never say cannot see far items without the spec. It would be very troublesome when playing sport too! I broke few spectacles when I was a kids. I just do not know how to hold the spec, it just fall like that and mostly was step by myself! :p