ELI5; When you close your eyes at night you see all these colours, and when you press your eyes they become more and more vilbrant the harder you push. What are those and where do they come from?
In: Biology
I don’t think the question of when there is no pressure has been answered.
They think it’s because the cells in our eyes including the retina ( like all cells) emit a very small number of photons. In the light we don’t notice them as the receptors in the retina are being bombarded with so many photons. But in the dark the retina can actually detect these and interprets them as colours and patterns.
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