Has your vision ever been affected by a condition unrelated to vision?

After I miscarried for the first time, I was in this deep depression. It actually affected my vision. Colors were less bright. Edges were less defined. The way I saw the world felt muted and flat. Like I was looking at a poorly printed image of the world.

Another less extreme example was when I had gestational diabetes. I hadn’t noticed the effect on my vision until after the fact. Probably because the difference was not as extreme and more gradual. Colors were brighter after my blood sugar was regulated.

Have you guys experienced anything like this?

Why do you think our bodies are reacting this way? (Besides “stress does weird shit to your body”?)

Would measuring depression through changes in vision be more objective?