use them if you have the balls or not
such are designed for up to 4 untis of bad sight, for bigger bad-sightedness smaller hoes with lesser distance between them should be used.
It works on principle of camera obsura, where if youlook through a very small hole, the whole room can be seen.
reason for recommendation: not dweakening the eyes as mainstream glasses designs.
the resolution on the original link is 1:1, the formu format is somewhat bigger sized
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