I have some retina (macula) damage in both eyes and have switched to reflex/red dot sights. This past week I was at a range that used stark white targets with orange bulls. I found I was having great difficulty finding the dot on the target. The shooting positions are covered but the sun was to my back on the target... bright! Is there any kind of filter or screen or polarizing lens that can be put over the front of the reflex to lower the reflected light? I was using a J Point on a 625 and a Browning on a Ruger MkIII. Thanks for any suggestions.