Eye shield "STRASSER BLINDER" $19.80 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: 13 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.