Thumb's Rule Tested: Visual Angle of Thumb's Width is about 2 Deg

A literal "rule of thumb" is that if you hold your thumb out at arm's length, it covers about 2 degrees of your field of view. https://t.co/qP1ig6MUY5. So let's use that to work it out. https://t.co/Sh2NStbjX6

@Mike_RBL_Rider @ProfTonyPollard https://t.co/OvAdFzuaxs https://t.co/58ClgaStDd https://t.co/Fe8FIECSBB

@willjharrison @LewisChuang @marius_s_klug @BenediktEhinger @CasLudwig Because you're a friend, @willjharrison , I just did the measurements: My eye-to-thumb distance is 57 cm and my thumb is exactly 2 cm wide (nail alone is 1.5 cm). Pretty standard, it…

@laurentperrinet @nickgaspelin @CGDePree this one by O'Shea maybe? https://t.co/Na5GOo1mSc "Thumb's Rule Tested: Visual Angle of Thumb's Width is about 2 Deg". I use it in a visual psychophysics course 👍