Kenzie Annis went to nursing school, and she would really like everyone on Love Island USA to know it. The trouble is that her credentials showed up in the worst possible moment: a basic disagreement about eyesight that she got spectacularly, confidently wrong on national television. It started during a flirty Soul Ties chat on Tuesday’s episode with Caleb McDaniel, the 21-year-old elevator installer Kenzie spent much of the season torn between. After noticing his freckles, she asked whether he had "really good vision." Caleb said he did, explaining that he has 20/13 eyesight. "20/13 isn't that good," Kenzie replied. "20/20 is the normal." When Caleb explained that a lower second number actually means better vision — adding that he'd even been told he has "fighter-pilot vision" — Kenzie wasn't convinced. "No it's not. I was in nursing school, bro," the 24-year-old nursing grad said before explaining that her 20/30 vision means she can see at 30 feet what other people see at 20.…