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Introduction – As a species, I doubt we evolved specifically to end up using computers, smart devices, and other sustained near-point activities. The signs of visual strain are common, but often go undetected or ignored. Use this tool to do a quick assessment of risk for yourself or your child. If the result shows further care is…
A large portion of the effect of this illusion is the early signal processing that occurs in the retina that enhances edge contrast and detects movement. The fuzzy circles in the centre appear to move, and this is more so when viewing the fine squares in the square pattern in the background.