does anyone else's eyes play tricks on them?

Tara
Does anyone else's eyes play tricks on them? 
Can you take a test and swear there is some kind of faint line and then your SO swears there isn't and you go outside and the faint line you saw in the bathroom is now gone? Because same...... 
I'm 10 DPO. This is the test I swear there is some kind of line on.