Praneeth
Ansys Employee

Hi Steven,

Sorry for the delay in my response. 

I am not sure what you mean by exporting mesh in point 3. You would have imported the CAD model from an external source, right? Also, you have mentioned that the flat lens results are not as expected. I doubt that the setup is not fully correct. To troubleshoot this, please raise a service ticket in the Ansys customer portal as this cannot be done in this forum.

Best regards,
Praneeth.