There has been evidence of a direct link between anxiety and eyesight for a long time, depression also comes with a variety of anxiety symptoms
A friend of mine was diagnosed as far-sighted (hyperopic) and prescribed glasses while suffering from major anxiety, when he recoverd his eyesight returned to 20-20, the optician told him about the link between anxiety and eyesight
Personally I have suffered from depression for many years and have some bad eyesight (myopia), I had an extended period of recovery a few years ago and my eyesight rapidly improved, since then a relapse has sent my eyesight spiralling backward, including some very severe blurred vision which reduced my eyesight to less than 1 foot before severe blurring (very short term, for a few minutes at a time, and only occasionally) and have since developed a kind of blank stare when looking at things, even close up
I have to make a very conscious effort to pick out detail as it's learned behaviour from my time suffering with depression, distant vision is nearly impossible, some days I can see properly for a few minutes before it reverts back to my normal myopia
Depression can affect every part of your life and your body, currently I suffer issues with diminished touch, taste, smell, hearing, eyesight and that's only a few of the many
Never underestimate the damage that depression can cause
and everybody I know who suffers from depression (15+ people) has eyesight issues