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two thoughts:

1 - does sun light have no physiological/psychological value for blind people? the sun light might still be captured on the skin or even in the eyes and trigger relevant biological processes.

2 - having a monitor is also important for a blind person when working in a team.

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I'm totally blind and have what I call no usable vision. I can see light if it's bright or the sun is shining. I can't tell anything about the environment from my vision though other then if there is bright light or not. Anecdotally from talking to other blind people the ability to see light helps set your body clock. Although I keep a fairly normally sleep schedule I know blind people who have no light perception and have a lot harder time keeping a normal schedule with out medicine.

The vast majority of visually impaired and legally blind have some degree of sight or at least light perception. The tiny percentage that does not still needs/like sunlight for vitamin D etc, but you don't get much sunlight form a window.

For those wondering: you can get lots of sunlight, but not any UVB (https://www.ncbi.nlm.nih.gov/pubmed/19614895: "All glasses totally blocked UVB radiation."), and that's what your body needs to make vitamin D (https://www.vitamindcouncil.org/about-vitamin-d/how-do-i-get...)

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