I am left eyed (right handed) and have always had trouble shielding stray light from the viewfinder of both my A7R and A7RII. I usually end up holding the camera with my right hand and using my left hand as an eye shield. I saw this over on SAR and just ordered one from ebay. I think this will be a big help to me.
Dave in NJ
PS I have no financial interest in this product.
Rubber Eyecup Soft for Sony A7II A7RII A7SII A77MII Cameras Great Video Usage | eBay