Your comments about peripheral vision are valid 24 carrot.
Another couple of examples of where one fixes their visual center is when scooping water with a water bomber you do not look at the far end of the lake because you will not be able to judge the wave action ahead of you and even more important you may not see any debris such as dead head logs in the pickup path.
Also during very low level agricultural spraying runs down long fields your life expectancy would be brief if you only looked at the far end of a long field.