Question about gles??

So my 4 yr. old son got diagnosed with astigmatism and hyperopia. Never thought he had problems with his vision. He never brings things close up to look at them or anything that gave any incling of a problem. So my question is are the gles for this really thick?? The prescription is: OD +2.50 Sphere -1.00 Cyl Axis 010: OS +2.50 Sphere -1.00 Cyl Axis 170. They said his case was pretty bad.