Optical illusions SPMS 8th grade
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Transcript of Optical illusions SPMS 8th grade
Optical IllusionsWERC
Visual Acuity
Part 1
Visual Acuity• Definition: sharpness of vision, measured by the
ability to discern letters or numbers at a given distance according to a fixed standard.
• If you have glasses, you don’t have good visual acuity. If you have 20/20 vision, however, you have good visual acuity.
• The visual acuity test is more commonly recognized as the Snellen Chart. It is used to test eyesight to see if patients need glasses.
What does visual acuity show about a person?• Visual acuity shows that a person pays large
attention to detail. They also think outside the box when it comes to simple things.
• The Snellen Test shows how well or how poorly a person can see.
How is visual acuity used in real life?• It is often used to test eyesight.• Fun Fact: Astronauts have to get their eyes tested
so that they can be positive of what they’re seeing in space.
Eyesight Tests
Part 2
Lines Upon Lines upon Lines
Test #1
Which of the yellow lines is bent?Neither. The yellow lines just appear to be bent because of the black lines “push them out.”
The Saxophone
Test #2
Look at the picture to the right.What did you see first?
Some people see a man playing a saxophone, but those with better eyesight see a woman.
Man With Saxophone Woman
Lines of Illusion
Test #3
Which side of blue seems brighter, left or right?The right side seems to have a brighter shade of blue, but both sides have the same shade. Since red is the opposite color of blue, it makes the blue pop out more.
Makes Your Head Spin
Test #4
Which circle is bigger?Both circles are the same size. The purple/red circles surrounding them make them seem bigger/smaller than they actually are.
Road to Illusions
Test #5
Which of the purple lines is longer?Hint: Don’t pay attention to the width of the line, just the length.
A Helping Hand
Test #6
Does the drawing of the hand look 3D?
Does the drawing of the hand look 3D? What if it’s turned like this?
Depending on your point of view, the hand looks like it either pops out at you are divots because of the curved lines.
3D Divot