I'm pretty sure the dullness is just the ligting. The description also says she is still wearing the eye patch which is clearly not the case. Also there realy are only 2 reasons to wear an eye patch, to cover up a missing or badly scared eye or to protect a damaged but still funcational eye. Her case is clearly the second as if it was completely nonfuncational there would be no comment about her recovering sight in her eye.
__________________
Higurashi: Its a bit like watching a trainwreck, except you keep getting to see different trains wrecking with roughly the same passengers, into a variety of different objects. Also, the trains are driven by monkeys. On LSD.