Are There Blind Spots in Our Eyes? Essay

1475 Words6 Pages
Are There Blind Spots in Our Eyes?

ABSTRACT
Our eyes are vital organs because they help us visualize our surroundings. But are our eyes perfect in seeing what’s right in front of us? Sadly I learned in our evolution, nature messed up at one point and gave us blind spots in our eyes. This project shows why we have these blind spots, how to discover them, and how big they are. I researched on how our eyes see things; why when one eye is closed, the other eye sometimes can’t see what’s in front of it. I also found during my research a formula that is used to estimate the size of a human eye’s blind spot. I performed an experiment using Blind Spot Test card I made to verify the existence of blind spots in my eyes. I also collected data
Use a black marker pen to draw a black dot and a cross on the two edges of the card. Make sure the dot and the cross are on the same level.

Hold the test card away at an arm’s length and at eye level, while the other hand holds a yardstick just below the left eye. Put the test card on top of the meter stick. Make sure the cross on the test card is on the right hand side.

Close your right eye and stare at the cross with your left eye. At this point, you should also be able to see the black dot.

Focus on the cross and move the test card towards you by sliding it along the yardstick slowly. At a certain point, the black dot will disappear from your vision. Record the measurement on the meter stick when that happens.

Continue to move the test card forward; you’ll notice the black dot will reappear again.

You can also test for the other eye by closing your left eye instead. This time you should look directly at the black dot with your right eye, and as you move the test card closer to you, you should notice the cross disappear and reappear again.

DATA AND DISCUSSION
The following is the formula for finding the size of the blind spot of a human eye:
S/m = d/D

In this equation, S is the size of the