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He has a very strong prescription, and you're seeing the reverse side of the refraction needed to correct his eyesight.
Not much you can do with lighting or posing, but you can fix it in post processing if you plan ahead, by shooting duplicates of each pose -- one with and one without glasses -- and then inserting the non-glasses parts into the with-glasses shots.
You can also fix the existing shots similarly; I've taken the liberty of making a sample. With experience it goes pretty quickly (this took me about 10 minutes, including the major retouching of the glasses area and minor retouching of the skin and hair), but it does take some practice before it goes that quickly.