This has been talked about a lot on here. I believe it gets amplified when you throw everyone in the same ring. Lens glare among a thousand other things are capable of looking a bird. I started using red dots 10 years ago. I don't believe I've ever had one spook from the lens but who's to tell. Been too many birds dropped to have been considered a real problem. Considering hunting cover, shading, terrain, yardage, weather and all the various angles we shoot birds at I don't even let it be an issue. If you are considering a scope but worried sick about glare, trust me it ain't worth the time. Just do it and enjoy the hunt.