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Reference.org
Hyperacuity
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<p>The sharpness of our senses is defined by the finest detail we can discriminate. <a href="/facts/Visual_acuity/1hj2u0ej">Visual acuity</a> is measured by the smallest letters that can be distinguished on a chart and is governed by the anatomical spacing of the <a href="/facts/Retinal_mosaic/mG9CxM3c">mosaic</a> of sensory elements on the retina. Yet spatial distinctions can be made on a finer scale still: misalignment of borders can be detected with a precision up to 10 times better than visual acuity, as already shown by <a href="/facts/Ewald_Hering/zSvDV8HY">Ewald Hering</a> in 1899. This hyperacuity, transcending by far the size limits set by the retinal 'pixels', depends on sophisticated information processing in the brain. </p>