How To Treat Headache After Wearing Spectacles?

Doctor my daughter is having headache and we have went to eye doctor.Her pint in right eye is -2.75 and her point in left eye is -3.25 with cylindrical -0.75. We have made glass with this new changes and she is wearing also. It had become 3 days after putting new glass. But still she is complaining about headache. Is it is normal ? If it so how much days it will take to cure her headache? Please reply