I know that the interaction of near IR (or IR-A, 700-1400nm) with the tissues of the eye is very complex. There are potential problems with the cornea as well as the retina due at least in part to small temperature changes induced in the tissues by IR-A absorption. It's also both wavelength and intensity dependent. Add in dilation of the pupil from reduced intensity in the visible range by dark safety lenses that may or may not absorb fully in the near IR and it can get complicated. I will try to dig up some biological information to add to the mix.
Robert
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