Everything you said is true, but it doesn't change my point, which is that opthalmologist has no idea what she's talking about :-) In practice green lasers sell because they're bright, and they crank up the power because everyone wants moar bright, and that's all there is to it.
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This is also why my original DPSS-module-based DIY laser projector had an external IR-cut filter in front. Also, I've noticed things getting worse. I used to have a 15mW green that actually had an internal discrete IR-cut filter, but they've been increasingly cutting corners.
Fun fact: you can xenon-pump one of those Nd:YVO4+KTP blocks from a DPSS laser pointer by just sticking it in front of a pocket camera's flash. The resulting beam is surprisingly well collimated, even with no lens.pic.twitter.com/3DXbCyYaQ4
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The part I find interesting is that the coupling is good enough by just sticking it in front. Usually you have a lamp around a laser rod, with reflectors. This is just a 1mm² crystal facet receiving maybe 1% of the light coming out of the much larger flash head :)
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