Yeah, John Seegers @ Laramy-K is great. All his videos are focused on optician training so it is nice to be able to see things from the other side of the bench. I have watched a bunch of his videos over the last couple of years.
The combination of John’s videos and searching through the back catalog on the Optiboard site is where I picked up the majority of my knowledge about glasses manufacturing, lens optics, and how glasses and prescribed and cut. Some fascinating stuff there for people who wear glasses and want to understand how things work behind the scenes.