How could someone with 20/20 eyesight still benefit from prescription glasses?

For some individuals, they can attain 20/20 sight  acuity, but it takes their visual system A LOT of effort to maintain  that clarity. For some, that will mean eyestrain or headaches, but for  some, they may not experience major discomfort that they are aware of.

Let 's look at a soccer example:

You can play  soccer with regular running shoes, but you often can perform better if  you wear cleats. Why? With the cleats you get a better push off and  better traction... less EFFORT to perform the task of running and  turning.  Does that mean that you will become dependent on wearing  cleats in order to play soccer?  No.  You can still play soccer with  regular running shoes.  Playing soccer with cleats provides benefits to  the player and allows him to exert his energy on other aspects of his  soccer game.

In many instances, wearing appropriately prescribed glasses for near work (reading/digital devices) can reduce the EFFORT and visual TENSION created by such near tasks. This can help increase ENDURANCE and  improve performance.  When shown to beneficial, performance lenses may  be prescribed.