Green spots in the viewfinder

A very excellent camera! If only the green spots in the viewfinder would not !! For many years I photograph mainly wild orchids - worldwide. Various models of NIKON have proven themselves and never fails. But over time the Geschleppe is too much to me. Since EM5 came with her folding screen on the market and has inspired me immediately. A little later, the EM1 came along and made me even more excited. However, it was the enthusiasm quickly a disappointment, and I mourned many times my good Nikons after. The reason: In the viewfinder green spots appeared and spread out ever further. The camera has been replaced by Olympus with a new one. But even here, soon the green spots on back. However, they only appear in the viewfinder, not in the finished photo. The expensive camera goes back to Olympus. When EM5 and the same application there is no such green spots.