Just when woke up, still a bit sleepy. Only eyes closed - no blindfolds. Three colors.
Session 1 - with mobile in front of eyes, low brightness setting. 82%
Session 2 - mobile away from eyes. 55%
Session 3 - same setting as 1, 82% again.
Observations: while facing the screen I can't see the colors, but I can notice a sense of brightness change between colors. I know this is not ideal, but it seems like a good way to start.

It is entirely made with AI prompts. I left it open for remixing: you can just press the "edit with lovable" button and customize it as you like.
I am changing and adding another exercises for my practice. Just added a "find the black spot" from an exercise I saw in a video.
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Do you think only closing your eyes would be fine for beginners?
I would put your phone screen down or away from you to avoid accidentally seeing the light
What app or program are you using?