A color vision test, also known as the Ishihara color test, measures your ability to tell the difference among colors. If you don’t pass this test, you may have poor color vision, or your doctor may ...

Optical Illusions for Testing Your IQ: An optical illusion is a mind-bending illustration of an object or a drawing or a picture that has different appearances and can be perceived differently. There ...

Test your eyesight without a trip to the eye doctor? Online vision tests aim to make it possible. Several companies offer tests that you can take on the internet with your computer or smartphone.

The cafe wall optical illusion posted on Twitter challenges people to figure out if the lines are straight or bend at an angle. A myriad of optical illusions keeps us glued to our screens as we keep ...