Faint Lines, No Lines, Line Eyes?!

Bee
I always begin doubting my eyesight when it comes to home preganancy tests! Especially when I see so many photos on glow of tests where people say they see vvvfl and I can't see a thing on them! Have I been discarding my "negative" tests because I can't see the lines because they don't exist and someone on here may have magical eyesight that sees lines? 
I can't comprehend telling someone they see a faint line if it's really not there and then getting their hopes up. 
Perhaps we all get Line eyes from squinting too hard!