I have a new patient whose Rx has not changed in 5 years. The patient is an engineer, Rx is roughly +1.00-1.00 x 180 OU with 2.25 add. Has been wearing clear CR39 AO Instinctive. Recently moved to desert and wants polarized sunglasses, and explicitly wants optics to align just like clear specs. Can anyone give insight on Instinctive design features and/or give advice on selecting design for polar (hopefully CR39) progressives that should fit the bill?