What googles for over glasses to keep the dust out are you guys having success with.
thanks

[2015 Z Force 800 53/Trail EPS]

Many make a goggle that fit over glasses and most work just fine. For me I tend to default to the Oakley L-frame sand MX  or a Scott as I usually wear a larger type glasses and they have always kept the BS out pretty well. Not cheap..but the lens is replaceable, quick straps fit fine and the seal lasts a long time. These:

http://www.oakley.com/en/mens/goggles/mx-goggles/l-frame-mx-goggles/l-frame-mx-sand/product/WGOO7008SD?variant=700285016313&cm_mmc=iProspect-_-PLA-_-Google-_-Shopping%2BFeeds&gclid=EAIaIQobChMI0e37qMi51wIVBjJpCh22GQFxEAQYAiABEgInSvD_BwE&gclsrc=aw.ds

My wife and I use Scott OTG Goggles.  Different styles and price ranges available.   We paid on sale like 37.00 each.  Been very happy with them so far.

Good overall protection. I used to be able to mow my entire yard without burning my eyes. I forestall to the weeds within the morning. I'm sure they'll work great on other projects, but I bought them primarily for lawn mowing. My frame is kind of large, but these glasses fit over them. whether or not you do not wear RX lenses, they fit well, are comfortable, and are light.