The right-eye injury sustained by Marc Staal on Tuesday night at 5:45 of the third period at the Garden when he was struck by a deflected puck is not believed vision-threatening or career-threatening, according to the Rangers. “Marc Staal was examined [Wednesday] by Dr. Mark Fromer, ophthalmologist, and Dr. Mendel Markowitz, maxillofacial surgeon,” the club announced in a statement released at 6 p.m. “The injury has improved significantly and both doctors are optimistic that Marc will make a full recovery.” Earlier in the day, Marc’s older brother, Eric of the Hurricanes, told reporters the defenseman, [was] “staying positive about it, which is the kind of person he is.” The Blueshirts moved quickly to fill the hole created by the absence of Staal, who will be sidelined indefinitely, by claiming 38-year-old Roman Hamrlik off waivers from the Capitals. Of course, filling the Staal hole with Hamrlik is tantamount to putting a single shovelful of dirt into the Florida sinkhole that swallowed up that house, but it is reflective of the desperation confronting the Rangers, who have no NHL-ready defensemen in the AHL and obviously aren’t comfortable entrusting Matt Gilroy with the sixth spot.