The baseball poses a potential risk to you and as a survival mechanism, you will pick it up with your eyes which will then allow you to take the next action to get out of harms way. So knowing that our eyes fixate on moving objects is great because we can use this to our advantage to help us read faster. This might seem a little weird initially, but soon you will get used to it and your eyes will acclimate to both following the tip of your finger and reading the words.
How do you think you were able to notice the baseball flying across the room while I was standing in front of you talking?
It was your peripheral vision that made it possible. Your peripheral vision is designed to pick up any relevant information within your eyesight range while you are focused on a specific object.
So again, how can we use this information to our advantage? You can use you peripheral vision to read multiple words at a time. That way instead of reading just one word at a time like most readers, you can read two, three, four or even more words at a time. Normally, most people read one word at a time by fixating on each word. When you use your peripheral vision to read, you look in the space between two words instead of looking the specific word, trying to read both words and then moving your eyes to the next pair of words.
To see color, shape and details, they could wait until ample light was available and use their central vision to study a relatively still object. This activity brought to you in partnership with Science Buddies. Already a subscriber?
Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue. See Subscription Options. Go Paperless with Digital. Key concepts The human eye Peripheral vision Central vision Introduction Do you only think of your peripheral side vision—peripherally? Materials Cardboard or foam board: One by centimeter board or two by centimeter square boards held together with tape Metric ruler A centimeter-long ruler works well.
Pencil A string, about 50 centimeters long A pushpin Stack of scratch paper or a newspaper Scissors or craft knife Disposable cup Glue or clear tape Construction paper or paper and markers. We suggest red, yellow and green but other colors work, too.
Flat surface to hold your board Helper Preparation If you have two by centimeter boards, tape them together so they form a by centimeter board. Place your board on a flat surface in front of you with the long side closest to you.
Find the middle of the long side; this should be 30 centimeters from each corner. Mark this place with a pencil. Place a newspaper or stack of scratch paper under the board to protect your surface underneath and carefully stick a pushpin into the board on the indicated place. Tie one end of the string around the pencil. Tie the other end to the pushpin so the string is exactly 30 centimeters long.
Use the attached pencil to draw a half circle on your board with a radius of 30 centimeters. Shorten the string until the distance from the pencil to the pushpin is two centimeters. Now draw a small half circle—within the larger circle—with a two-centimeter radius.
Remove the pencil, the string and the pushpin and carefully use the scissors to cut along the big and small lines. You may want to get help; thick cardboard or foam board can be difficult to cut.
You should be left with what looks like a rainbow. The big half circle is the outer edge of your vision protractor, the small half circle cutout makes a place for your nose. Pin the pushpin near the outer edge of the protractor, directly across from your nose hole. Be sure the pin is not poking anything but the protective paper underneath. If the protractor were a rainbow, this point would indicate the highest point of your bow.
This pushpin will serve as a focus point, or a point to look at while you perform each test. Tape some scratch paper around the point of the pushpin so it does not accidently poke any items or people. Attach a disposable cup on the bottom of the protractor, near the center. This will serve as a handle. If you started with two by centimeter boards, you might need to attach reinforcement on the bottom side so the two pieces of the protractor stay flat.
You can use the scrap pieces of board for this. Your vision protractor is now ready to use. However, as Oukile says, this is mostly due to your retina. Cones are better at fine detail than rods for several reasons smaller size, less noise in the wiring, etc.
The fovea is filled with only cones; while the periphery is mostly rods with a smattering of cones. Your brain does not get the peripheral information in high acuity because it is not given it by the retina. As far as what vs. Just want to repeat this point. However, as other people have said, acuity gets progressively poorer the farther you get from the foveal region, which is why magnification is so important for these patients.
Factual Questions. The rest will give you an unsharp image which is still good enough for a variety of function, such as: detecting items of interest on which to focus your gaze.
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