The development of folding models to calculate optical potential for the ³He elastic scattering has shown that it is important to include exchange effects, saturation effects and second-order terms for a potential to accurately predict the cross sections. Scattering ³He beams at different energies probes different regions of the surface and emphasizes the limitations of such models. Using the measurement of ³He elastic scattering from ⁵⁶Fe at 33, 53 and 83 MeV a double folding optical-model potential has been developed which includes a reformulation of the second-order effects. The sensitivity of ³He scattering to the detailed shape of the potential in the surface region is demonstrated.