As an intern moving data centers the old networking guy told me to look into them; I used my right eye and now my eye is 20/40 a decade later whereas my left ey

As an intern moving data centers the old networking guy told me to look into them; I used my right eye and now my eye is 20/40 a decade later whereas my left eye is still 20/20. I did hold it up to my eye because it was hard to see..