Newton's Eye Experiment: The Needle Behind the Eye
Around 1666, the young Newton performed a highly dangerous experiment on his own body to study vision. He slid a bodkin—a thick, blunt sewing needle used for leather—between his eyeball and the surrounding bone. By pressing the needle as close to the back of his eye as possible, he altered the physical shape of his eyeball to record the visual sensations.
The dark room and the split sunbeam
The brave and painful eye-poking experiment
Putting the rainbow back together
The global battle over light and color
diego Newton slid a thick, blunt sewing needle between his eyeball and bone, pressing the back of his eye to record sensations.
What was the main scientific question Newton wanted to answer by pressing on his own eyeball?
What household sewing tool did Isaac Newton slide behind his own eyeball to study visual perception?
Notebook sketches: Newton's handwritten notes detailing his eye-poking experiment, complete with diagrams of his eyeball and the needle, are preserved at the Cambridge University Library.
diego Newton's 1600s optical experiments showed these visual rings instantly fade when motion stops.
What is the modern scientific term for the light patterns and colored rings seen when pressing on the eyeball?
What did Newton observe happened to the colored rings when he held both his eye and the needle perfectly still?
A blunt needle with a large eye used for drawing tape or cord through a hem. Around 1665, Isaac Newton slid this instrument behind his eyeball to study how the eye perceives colors.
diego Adjust the lens and light rays to discover how the eye projects images internally.
According to Newton's eye sketches, where did a spot appear in his visual field when he pressed the outer edge of his eyeball?
Which light-sensitive tissue lining the back of the eye did Newton identify as the true screen where vision is made?
diego Newton's Eye Experiment
In Newton's eye experiment, he pressed a bodkin close (pressed it close) / To find the colors in the dark
What major physical danger did Isaac Newton face when he inserted a needle behind his eyeball?