LekhoriLekhoriA smear, smudge or blot.
Something that appears hazy or indistinct.
The surroundings went by in a blur.
Haziness, blurriness.
From earlier blurre, probably an alteration of blear, from Middle English bleren, from Old English *blerian (attested in āblered (“made bare, made bald”)), from Proto-West Germanic *blaʀjan, from Prot...
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Unfortunately, a small artificial pupil also tends to increase the amount of diffraction somewhat, but this increase in blur is considerably smaller than the decrease that results from the control of other factors.