It only comes with one pair. So if you have multiple people need multiple glasses. There are valid questions about the effectiveness of the ones that come with it as well as the SM enclosure itself.
Any enclosure should just be considered as secondary protection. The amount of protection provided by good safety glasses is greater than any enclosure will provide. But both should really be used.
Some do argue that reflected light reduces the danger. While it may be true in theory, I’ve definitely found that in practice that there have been many times due to the reflectivity of some objects and the angle and distance I was at that I was very glad I was wearing safety glasses. It was bright enough with them on that I questioned their effectiveness.
I do try to avoid looking at it as much as possible. Sometimes it is necessary to make sure it’s working properly. If I need to I try to look through my enclosure with safety glasses on.
Overkill? Maybe. I only have 2 eyes. I’ll err on the side of caution.
-S
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