A member asked:

My sisters glasses number is -9 even though shes just 14 and seems to be changing every 3-5 years. how much worse is it going to get?

A doctor has provided 1 answer

Prescription changes: Your Sister's myopia is expected to change (increase) over several years, which is influenced by her genetics and possibly prolonged reading-type tasks. Unfortunately it would be difficult to tell you how much more nearsighted she will become but it usually slows in the mid 20s, with fewer into the early 30s.

Answered 5/16/2014

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