1. Opthos Instruments Inc 17805 Caddy Dr, Derwood, MD 20855 Coordinate: 39.14743,-77.15751 Phone: (301) 926-0589
2. Tecnoideal America 7600 Standish Pl, Derwood, MD 20855 Coordinate: 39.11049,-77.15626 Phone: (240) 403-4063