Odnosno za osobe sa 20/20 vidom:

"Everyone knows from their high school geometry classes that a circle is 360 degrees (360°). For angles smaller than 1 degree we use arcminutes and arcseconds as a measurement. An arcminute is equal to one sixtieth (1/60) of one degree. "Normal" visual acuity is considered to be the ability to recognize an optotype (letter on the Snellen chart) when it subtends 5 minutes of arc. We can most certainly see objects below this level, as this describes only our ability to recognize a very specific shape. Taking this a step further, we find that the lower limit of "resolution" of average eyes equates to roughly ½ the limit of acuity. In other words, the average person cannot see more than two spots (pixels if you will) separated by less than 2 arcminutes of angle. "