I had myself checked in today, as my glasses needed adjustment.
After the test where done I was informed that I didn’t have depth perception, and that he only got such customers 1 / 2 times a month.
We did a test in which the left eye had a +, and the right eye had a ( ).
If my eyes worked fine, then it should look like ( + ), but this isn’t the case. I’m not able to overlap both my eyes to get that, instead I only see part of it. Either a + from the left, or a ( ) from the right.
He informed me that this is called “Alternative looking”, but I’m not able to find anything about this online.