# The Apple In Your Eye

June 14, 2010

Chances are, if it has been a while since your last algebra class, you may be getting a headache right now. Luckily, Vern Seward at The Mac Observer did most of the math for us. An eye with 20/20 vision can discern images at the angle of 1 arcminute. That means at 1 foot from the eye, you can see objects 0.0035 inches in size. Now if you compare that to Apple's screen, its pixels are only 0.0031 inches in size. That means that someone with good eyesight, holding it a foot away, will not be able to make out pixels. So is Steve right? The answer is yes and no. The science obviously backs his claims, but there are some things to consider. 20/20 is considered "good' vision, but it's not perfect. People with perfect vision can see objects at angles of 0.6 arcminutes. That means that individuals with perfect vision might be able to discern some pixel edges. However, pay attention to how close you hold your iPhone some time. If you keep the phone about as far away as you do your keyboard, that is closer to 18-24 inches. At that distance, even someone with perfect eyesight can't make out the pixels. So does the screen on the iPhone 4 look perfect to the naked eye? We'll just have to see for ourselves on June 24th.