Anybody else practice Trātaka focused meditation ?

I practice this simple form of single pointed focused meditation most days as part of my personal yoga practice at home with a candle flame and have really come to value it. I have also practiced in certain spaces with a more "formal" Yantra that was backlit in a dark-ish room and that has been a great experience as well.

Things I appreciate about it - simplicity, ability to open and close eyes (as opposed to strictly eyes closed), calming effect on my vision, variety of internal "vision" once you close your eyes after the soft gaze with eyes open.

I have found Trātaka meditation to be one of the most accessible and "successful" (if you want to accept the use of that term in regards to meditation) methods for me and I look forward to the experience everyday.

I learned it intially from one of my teachers and have kept it up as a normal part of my yoga practice, but have not taken a deep dive yet on its textual, historical and cultural roots. Feel free to share any of that information if you have gone down that road yourself and know. Basic searching indicates it may have tantric roots and that it appears in Hatha yoga pradipika, though I'd imagine it's referenced somewhere prior to that as HYP is a "compilation" of sorts and not an text that introduced previously unknown practices.

Anybody else practice it or have experiences they want to share?

Google search link if you're unfamiliar -

https://www.google.com/search?q=trataka&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari