An Amsler grid is a diagnostic tool used to detect vision problems caused by macular degeneration or other eye diseases. It features a grid of straight lines with a central dot.

Today’s optical illusion challenge is all about testing your observation skills. At first glance, the image looks simple. Just a grid of two-digit numbers like 67, 76, 87, 78, and 91, neatly ...

Eye - Red dots visual field test with blue on yellow & blue on red macula test grid. Skip to main content. Thank you for visiting nature.com.

Red Dot 'Eye Test' Prompts an Internet Uproar "Calm your mind and stare at this red circle," the puzzle's creator wrote. By ABC News. April 7, 2016, 11:55 AM.

Eye condition could cause blindness – and only an eye test can detect it. ... “If I hold this grid up and you focus on the dot at the centre with your right eye, ...

To give a spider an eye test, ... See, the retinas don’t track the dot. Figuring out how the spider’s tiny brain manages this eye-to-eye communication is next on the agenda.

An optical illusion featuring a grid of “38” challenges viewers to spot the odd pair hidden within. This brain teaser tests your observation skills and cognitive sharpness. Optical illusions ...

The image above comes from a 2000 study on the Hermann grid published in the journal Perceptions.Scientists from the Laboratory of Statistical Physics at the University of Oregon explain that we ...

Optical Illusion IQ Test: A grid illusion can deceive the vision of any person. We challenge you to find the black dot in this mind-bending scintillating optical illusion challenge that almost 99% ...

This is the online quiz that is the talk of the internet - the DOT test. Created by web quiz specialists Playbuzz, the DOT test has left thousands of users puzzled this week. Compiled by Playbuzz user ...