Optical Illusions: How Your Eyes Lie to You

Questions in this quiz

All 10 shown. Answers not revealed.

1. 1

   Why does each eye have a blind spot?

   Multiple Choice · 20s

   AThe lens cannot focus at the edges

   BThe optic nerve leaves the eye there

   CThe eyelid blocks part of the retina

   DLight bends around the pupil
2. 2

   What is pareidolia?

   Multiple Choice · 20s

   ASeeing colours that are not there

   BLosing vision at the edges

   CSeeing faces or patterns in random objects

   DBeing unable to judge distance
3. 3

   Staring at a bright image and then looking away can leave an afterimage.

   True / False · 20s

   TRUE

   FALSE
4. 4In the Muller-Lyer illusion, two lines with arrows at the ends appear to be what?Multiple Choice · 20s
5. 5What is the impossible triangle that cannot exist in three dimensions called? (one word is enough)Type Answer · 30s
6. 6Why do we see very little colour at the edges of our vision?Multiple Choice · 20s
7. 7The brain sometimes changes what you see to match what it expects.True / False · 20s
8. 8Why did people disagree about the colours of 'the dress' photograph?Multiple Choice · 20s
9. 9What happens if you stare at a waterfall and then look at rock?Multiple Choice · 20s
10. 10What is the layer at the back of the eye that detects light called? (one word)Type Answer · 30s