Defenders Hand blocking opponent's vision

[hoopguy]

AKA - Shane Battier defense; Watching the Heat in the playoffs, I can't help but notice Shane Battier holding his hands in front of his opponents eyes as often as possible. By NFHS 10-3-6c this would be an unsporting technical foul. Has anyone every called this? I can't remember seeing this called but I also can't really remember players doing this. I have a feeling we will be seeing a lot of it now as players emulate this tactic they have been watching during the playoffs and some coaches will probably teach it.