Flash blindness incurable?

It seems cure blindness does not cure flash blindness (a log snippet below). I thought it would, or is this by design? In case there's only a chance of curing it, it's lacking an echo to that effect ("You failed to remove the flash", or some such; similar to e.g. cure disease): Physical effect: 'flash' modifies hit roll by -4 for 1 hours. You can't see a thing! <567hp 619m 1051mv><4 AM> heal blindness You pay someone 700 copper coins. Someone closes its eyes for a moment and nods at you. <567hp 619m 1051mv><4 AM> Someone closes its eyes for a moment and nods at someone. <567hp 619m 1051mv><4 AM> heal blindness You pay someone 700 copper coins. Someone closes its eyes for a moment and nods at you. <586hp 619m 1052mv><5 AM> heal blindness You pay someone 700 copper coins. Someone closes its eyes for a moment and nods at you. <586hp 619m 1052mv><5 AM> ... The bright light fades from your eyes. <902hp 619m 1052mv><6 AM>