Spot the Difference puzzles are excellent for testing an individual's observation skills and memory. Spot the difference ...

Optical illusions are great at testing your visual perception and seeing how your brain interprets visual context, subtle ...

An optical illusion is a visual phenomenon where the brain misinterprets what the eyes perceive, creating a false or ...

The Waterloo Differential Acuity Test (WatDAT) – which was developed with funding from Fighting Blindness Canada – assesses ...