As Daryo correctly points out, this has nothing to do with light. They are talking about eye damage:
"Children as young as four and five now have multiple pellets in their retinas, blinding them partially, or fully, for life. At the start of September, doctors at Kashmir’s main hospital reported that on average, one person had their eyes ruptured by pellets every other hour since 9 July."
https://www.theguardian.com/world/2016/nov/08/india-crackdow...Cf.
https://peoplesdispatch.org/2018/11/27/pellet-shotguns-conti...These weapons are described as "non-lethal," which doesn't mean they can't seriously hurt someone. Whether they can be used to kill someone depends, I'd say, on ballistic perfomance, among other factors.
However, it should be noted, as quoted above, that people may only be partially blind (which is not the same as temporary).
Best