When looking around, far away objects move on the screen more than closer objects, so they need more space to move side-to-side and up-and-down, hence the cropping.
Uma ubheka nxazonke, izinto ezikude zihamba esikrinini ngaphezu kwezinto ezisondele kakhulu, ngakho-ke zidinga isikhala esithe xaxa sokuhamba eceleni nangaphezulu nangaphezulu, yingakho ukunqampuna.