what the problem with my eyeglasses is?

[driving glasses]

End of last month I bought a pair of prescription eyeglasses online, after wearing them I met a thorny problem, when I was walking or reading for a long time, I felt dizzy, but there is nothing wrong with my eyeglasses, I don't know the reason with this. My mathematics teacher told me that my prescription lens may have exceeded degree, but the local eyeglasses shop checked nothing wrong with the lens? Do you know what the problem with my eyeglasses is?