Yes, there are several posts on here that talk about how to address glare on the 7xx units.
Two easy things to consider:
1) Dark, solid color shirts help with clothing-related reflections that affecti screen visibility.
2) I recall some folks fashioning a sun shield by velcroing a U-shaped "hood" around the the bezel using dark cardstock or other material.
In my aircraft, glare issues are uncommon enough that it's easy to just shade with my hand on the rare occasions it's necessary..