Eye shield "STRASSER BLINDER" $18.61 Rubber disc that is placed on the iris diaphragm to block the sight of one eye when aiming. A must when you have the "wrong" eye as dominant. In stock. Add to cart Share Stock: 14 Information Reviews Rubber disc that is placed on the iris diaphragm to block the sight of one eye when aiming. A must when you have the "wrong" eye as dominant.