CHANGAR Prism Glasses Light-weight Lazy Glasses Horizontal Reading Spectacles 90° Vision Neck Protection Prism Glasses for Bedridden Lying Down Reading and Watching TV/Mobile Phone in Bed

Whittling or knitting might be interesting to him? Or tiny canvases to paint on? Not sure what kind of engineer he is, but there are many DIY kits these days, he might be into CircuitMess kits for adults, or I've also seen a cool DIY Stirling engine kit recently too! Also highly wanted to suggest these prism glasses, I use them for knitting and reading when both sitting and laying down and it has totally saved my neck!