Elementary yet interesting. I just "constructed" a pinhole by curling my index finger in my thumb, and could read letters on this page. At the same range without wearing contacts or glasses, I am unable to separate words. Only lines of text.

I use glasses in the evening and contacts in the morning, so the dimming could perhaps be beneficial for circadian rhythms if I need to use a computer, although I recognize that probably has more to do with the spectrum of light than the intensity.