On Thu, Aug 17, 2017 at 11:20 AM, systems_glitch via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
Thanks for the information! W.R.T. welding gear, it's typical for cutting glasses to come with a Shade 5 insert, and for arc welding helmets and face shields to be Shade 10. So, according to the recommendations, anything you get stock at the hardware store is likely to be too weak.
Now, it's also my understanding that the shade value is for reducing eye strain and the worker's comfort -- too low of a shade will strain your eyes, but it's my understanding that the UV protection is inherent in any shade insert. So, if you do happen to have too weak of a shade insert in your gear, it'll probably make looking at a too-bright source unpleasant, but not dangerous. Again, what I've been told, so don't trust your eyeballs to that!
I'd be surprised if the optometrist was giving out insufficient eyewear, since they would likely be legally liable for any eye damage resulting from the use of the glasses they were handing out.
Thanks, Jonathan
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With my kids I plan to use a shadow box, not look at the sun directly anyway.