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Afterimages. The Human Eye. The human eye has cone cells for detecting red , blue , and green light. These cells are used for daylight vision. Rod cells are used in night vision since they detect only light and dark.

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The Human Eye

  • The human eye has cone cells for detecting red, blue, and green light. These cells are used for daylight vision.

  • Rod cells are used in night vision since they detect only light and dark.


You should have seen a red heart after staring at the cyan heart since you have exhausted the green and blue cone cells from staring at cyan.


Your eyes are capable of resolving an even more complicated picture. Stare at the center of the next slide.


Your eyes are capable of resolving an even more complicated picture. Stare at the center of the next slide.


Color Blindness picture. Stare at the center of the next slide.



Color Blind Test picture. Stare at the center of the next slide.


What do you see in the next slide

What do you see in the next slide? picture. Stare at the center of the next slide.


Color Blind Results picture. Stare at the center of the next slide.

  • Everyone should have seen the number 25.


What do you see in the next slide1

What do you see in the next slide? picture. Stare at the center of the next slide.


Color Blind Results picture. Stare at the center of the next slide.

  • If you have normal vision you should see the number 45.

  • If you are red-green color blind you will probably only see spots.


What do you see in the next slide2

What do you see in the next slide? picture. Stare at the center of the next slide.


Color Blind Results picture. Stare at the center of the next slide.

  • If you have normal vision you should see the number 6.

  • If you are red - green color blind you will probably only see spots.


What number do you see in the next slide

What NUMBER do you see in the next slide? picture. Stare at the center of the next slide.


Color Blind Results picture. Stare at the center of the next slide.

  • The individual with normal color vision will see a 5 revealed in the dot pattern.

  • An individual with red - green (the most common) color blindness will see a 2 revealed in the dots.


Optical Illusions picture. Stare at the center of the next slide.


This is another great example of concentric circles that look like a spiral. The red and black diamonds further add to the illusion, and even give the illusion some depth, because they are drawn in perspective, with the center as the vanishing point. This type of perspective is called one-point perspective and involves two sides of each object pointing to the same spot on the page. This is one of my favorite optical illusions!


Is it really moving? look like a spiral. The red and black diamonds further add to the illusion, and even give the illusion some depth, because they are drawn in perspective, with the center as the vanishing point. This type of perspective is called one-point perspective and involves two sides of each object pointing to the same spot on the page. This is one of my favorite optical illusions!