Optical illusions are the tricksters of the puzzle world; they are designed in such a way that they fool our brains and eyes.

Let’s face it, our brains and eyes can be easily tricked into believing that something is real, even when it isn’t. That’s where visual illusions come into play; these images are designed to exploit ...

Results from smartphone-based Snellen charts, which are eye charts used to measure visual acuity, are not consistent with results from standard Snellen visual acuity chart tests, according to a study ...