Get Entities in player's vision/sight 1.12.2

[poopoodice]

As title, Is there a way to get all entities that are in the player's vision/sight?

If yes, how do I use it?

Is it something to do with 

moving object position

?

Edited October 8, 2019 by poopoodice

[DavidM]

Note that the client can lie about whether an Entity should be rendered. The server should implement some checks to make sure the client's information is in legal range.