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A comment on Declining eyesight improved by looking at deep red light. Parent comment

Re:Declining eyesight improved by looking at deep red light by mrob on Tuesday June 30, 2020 @05:44AM (#23688364)
The D line is probably more easily seen in a colored flame made by adding salt water to an alcohol-burner flame:

https://en.wikipedia.org/wiki/Emission_spectrum#/media/File:...

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Re:Declining eyesight improved by looking at deep red light by monkeycantype on Tuesday June 30, 2020 @06:58PM (#23695774)
that sounds like a project to do with my kids, thanks : )
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