What does the phrase "cross your eyes" mean in this context? [closed]

Solution 1:

Crossing your eyes makes it harder to see clearly. This usage means unless you are paying close attention to the differences between the two things, you won't notice them.

I haven't heard this expression used before, but in my personal experience, I have heard people say "if you squint hard enough..."

Solution 2:

I have not personally encountered the usage of cross your eyes to mean squinting as indicated in your linked reference. I had always heard it used to mean making your eyes appear to be crossed. The condition esotropia is commonly referred to as being cross-eyed:

Esotropia is a form of strabismus in which one or both eyes turns inward. The condition can be constantly present, or occur intermittently, and can give the affected individual a "cross-eyed" appearance.
_Wikipedia

You can usually accomplish crossing your eyes by trying to focus your eyes on the tip of your nose.

In addition to a funny looking face, you could get double vision, or lose focus, or something else, and thus have trouble seeing things clearly.