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The phenomenon in question is anisochromatopsia, however this term is rarely used. This phenomenon is always present, however it is rarely mentioned subjectively, while objective color testing will reveal it easily. In pathologic state, the term Color Desaturation is being used defining that the previous status of color vision has changed to "abnormal" one. ...


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A comment by @ddiez made a good point at identifying some ambiguity in the question: sight vs concentration. Sight has been answered well by @Ilan. You can't test to see if someone is squinting to concentrate. I stick by my original comment: Isn't it a social tool to show others you're thinking? It would be difficult to come up with a scientific ...


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The phenomenon in question is probably related to people with uncorrected/undercorrected myopia. This "ancient" phenomenon is called stenopeic slit effect (a case of pinhole effect): when the person squints the visual acuity becomes better because of smaller blur circles: the "slit" between the eyelids is the key point improving blurring. One can check if ...



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