vizio

A seam that looks false and is not. Esperanto is full of pairs that look related and are not: vespero and vesperto fourteen ranks above this one, masto and mastro sixteen. This is the opposite case. Vidi, rank 55, and vizio both descend from Latin videre, to see. The d turning into z is regular: Latin built its participle on vis-, which is why English has visible and evident from one root, and Esperanto inherited both shapes. Trusting the resemblance here gets you the right answer.

But you still cannot decompose it. Vizio is a borrowed root, not vid- plus anything, so it takes no part in Esperanto's building system: there is no *vizi verb meaning to see. And it never means eyesight. English vision covers the faculty (her vision is poor), and Esperanto refuses that job entirely: eyesight is vidpovo or vidkapablo. Take the English word apart before you translate it.

The fence against revo. Revo, rank 693, is a daydream or an aspiration, something you want. Sonĝo, rank 548, is what happens in your head while you are asleep. A vizio is neither: it is something that appears to you, an apparition, or in the modern managerial sense a picture of a future you claim to have seen. That second sense is now the commoner one in print, and it is worth noticing that the language kept the mystical flavour underneath it, which is roughly why havi vizion about a sales target sounds as pompous in Esperanto as it does in English.