CAA dont actively encourage LASER SURGERY therefore there is no "limit for laser surgery"
I think what you mean is that the prescription cannot be more than -5.00 right?
Well my prescription was OK but i Had an astigmatism of -3.75 of which the CAA allow you only to be -2.00 for Initial and -3.00 for renewal....
I had my lasik done in march... and came to 0.00 prescription/astigmatism in LEFT eye and -0.50 astigmatism in Right eye which is 1.5 within limits
hope this clears it up
JON