A printable Snellen Chart, which you can download online.
Something to cover one eye at a time, like an eye patch or a paper cup.
Scissors.
Tape or tack to hang the chart on your wall.
Pencil or pen to record your results.
I believe it has a negative effect on everybody! People around the world are now so caught up on whats happening on their phone and other peoples lives they don't even know whats going on in their life. They are so obsessed with their phone they cant take 10 minutes to themselves without going on technology and without texting on their phones just to see whats happening with someone else so that we can feel like Oh their lives are so much better than mine or how we wish we could be them. But what they don't see is how Oh I am so blessed to have this or Oh my life is so amazing. Not to say that to others but to say that to themselves.