Are there any disadvantages of not using your eyes when they are not necessary?

Suppose you are looking for something. Do you need your eyes? Yes.
Suppose now that you are walking to the bathroom of the house you lived in for years. Do you need your eyes? Clearly, you don't, you have the path clearly memorized, you know where everything is. Why would you use your eyes?

I have been avoiding using my eyes when they are not necessary for a few months now, and here are the effects noted
>better sleep quality
>improved visualisation
>improved focus
>eyes never tired
>have headaches less often
>thinking faster (solving problems in mathematics is easier)
and so on.
As you see I haven't noted any negative effects. Should I expect any?