the so-called "personal a" (you can google it) is used before a direct object if that direct object is considered to be a "person. "This is just one element that helps to make the word order more flexible in Spanish than in English.

Though, the "personal a" exists, as Phil has said, this is not the case. The personal a appears only when the verb being used includes a dative (indirect object). I said no to him = yo le dije que no a él. "Ver" (to see) is not that kind of verb, it only requires accusative (direct object), so this is just because in Spanish the verb "ver" uses a preposition whereas the Egnlish verb "to see" does not. This is very common. You will find that, many verbs do use the same preposition: She dances on the table = ella baila sobre la mesa. Sometimes verbs use completely different prepositions: He is married to Pamela = él está casado con (with) Pamela. Sometimes either one will use a pronoun and the other one will not. He serves God = él sirve a Dios. He said nothing to me = él no me dijo nada. I hope this answers your question.