Fig. 19 Hockey visors. Offer only partial eye protection and no protection to the teeth and lower face. Not recommended. Left: A hockey visor certified by HECC and CSA to CSA Z262.2 M90. ASTM F513 does not apply, since only full-face protectors have ASTM standard specifications. Center: A visor that has had material removed from the lower central portion (a common practice among professional players) and no longer passes the coverage requirements of CSA Z262.2 M90. Note how a stick may impact the eye from a sharp inferior angle. It is very difficult for an official to recognize that the inferior portion of a visior has been altered. Right. Slightly tilting back the helmet, as is often done by hockey players—and is not at all limited by the single chin strap—allows direct passage ot the stick blade into the eye from a nearly horizontal angle of attack.