Less grievous, perhaps, than it might otherwise have been, but worrisome in its own way. To hear so easily of an elf losing something that was born into the race was deeply unsettling, and Thranduil's eyes took on a hint of worry as he looked at his son.

"You must, then, be careful. To lose the keenness of ones sight is not so bad as to lose it entirely, but may be dangerous enough in its time."

He would watch him, protect him. It was ever thus, of course, Thranduil guarded those around him, but such a disability could be more than troubling in the wrong situation, and merited extra caution.