Sunday, February 9, 2025

The Eyes Have It©

 


 

Author’s note -- I hope that you enjoy learning from this resource!  To help me to continue to provide valuable free content, please consider showing your appreciation by leaving a donation HERE.  Thank you and Happy Trails!

 

Number five of “The Ten Commandments of Situational Awareness©”, HERE, states to always be AWARE of your surroundings, and to do that you need to use all your senses, but 80% of the information that your brain processes in any fast paced situation is received by your eyes and most of that is from your peripheral vision, so the eyes have it!

 


Your field of vision is the area you can see when looking forward without moving your head.  The human field of vision is determined by the shape of our skulls, the placement of our eyes on the front of our skulls, and the structure of our eyes.

 


Because of these biological givens, the normal human visual field is between 160o to 170o, side to side and 130o to 135o, up and down.  There are two types of vision; central vision, which is a cone 60o to 70o wide directly in the front, and peripheral vision, which is also called “side vision” or “indirect vision”, and covers between 95o and 100o to each side of the head.

 

This means that your visual field, horizontally, is from about “9” to just past “3” on the clock dial and vertically, from about “1” to almost “5” on the dial.

 

Your peripheral vision, or as it sometimes called “peripheral awareness”, is less focused than your central vision, and because of this it is weak at distinguishing detail, color, and shape, but it is extremely strong at detecting movement and light.  The visual information picked up in your mid and far peripheral fields, actually travels 25% faster to your brain than information coming from your central vision.  Your peripheral vision is also used to help you stay upright; in fact, your brain uses 20% of its visual capacity just to keep you standing!

 

Directly ahead of you at “12” on the clock, in the central vision cone, is where you can see the best, with the most detail.  And in the very center of your central vision cone is the foveal cone, and this is where your vision is the sharpest.  The foveal cone is only about 1o wide, and outside of this cone your visual acuity drops off rapidly.  Outside of the 10o degree cone, surrounding the foveal cone, you can only see about one-tenth of what you can see within the foveal field.  That is why you must “put your head on a swivel” and actively scan your surroundings.

 


By scanning your surroundings, turning your head to the right and left and using your peripheral vision, you are able increase your visual field by 60o on each side, or to “5” on the clock dial, and all the way around to “7” o’clock.  

 

So, actively scan your surroundings, by turning your head from either your left or right to your center over a count of one second, or “one-mississippi”, then scanning your forward area for one second, or “two-mississippi”, before moving your head to the other side over a count of “three-mississippi”.

 


Keep your head on a swivel and stay aware and stay safe.

 

Don’t forget to come back next week and read “Strengthening the Eyes©”, where we will talk about strengthening your peripheral vision and how this will help you.

 


I hope that you enjoy learning from this resource!  To help me to continue to provide valuable free content, please consider showing your appreciation by leaving a donation HERE.  Thank you and Happy Trails!

 

I hope that you continue to enjoy The Woodsman’s Journal Online and look for me on YouTube at BandanaMan Productions for other related videos, HERE.  Don’t forget to follow me on both The Woodsman’s Journal Online, HERE, and subscribe to BandanaMan Productions on YouTube.  If you have questions, as always, feel free to leave a comment on either site.  I announce new articles on Facebook at Eric Reynolds, on Instagram at bandanamanaproductions, and on VK at Eric Reynolds, so watch for me.

 

That is all for now, and as always, until next time, Happy Trails!

 

 

Sources

 

FAA’s Civil Aeromedical Institute; “Pilot Vision”, FAA Aviation News: A DOT/FAA Flight Standards Safety Publication, April 1998, page 19 to 20, https://books.google.com/books?id=6QL35AnwsD0C&pg=RA1-PA20&dq=%22field+of+vision%22+aviation&hl=en&newbks=1&newbks_redir=0&sa=X&ved=2ahUKEwjin77h87KLAxXcm4kEHbviJzQQ6AF6BAgKEAM#v=onepage&q=%22field%20of%20vision%22%20aviation&f=false, accessed February 7, 2025

 

George, Fred; “Can You See In Time To Avoid”, Flying Magazine, April 1991, pages 81 to 84, https://books.google.com/books?id=l29cHVBNFhMC&pg=PA81&dq=%22field+of+vision%22+aviation&hl=en&sa=X&ved=2ahUKEwivmoLFhbOLAxVCD1kFHSWUNSs4KBDoAXoECAUQAw#v=onepage&q=%22field%20of%20vision%22%20aviation&f=false, accessed February 7, 2025

 

Grand Developmental Vision Institute; “2 Ways Strong Peripheral Vision Can Help You Avoid Sports Injuries”, January 12, 2021, https://www.grandvisioninstitute.com/2-ways-strong-peripheral-vision-can-help-you-avoid-sports-injuries/, accessed February 8, 2025

 

Langewiesche, William; “The Eyes Have It”, Flying Magazine November 1978, page 116, https://books.google.com/books?id=S8rkR5Hozv8C&pg=PA116&dq=%22field+of+vision%22+aviation&hl=en&sa=X&ved=2ahUKEwj738f6hrOLAxVCMlkFHVyVEso4PBDoAXoECAsQAw#v=onepage&q=%22field%20of%20vision%22%20aviation&f=false, accessed February 7, 2025

 

Newman Therapy Services; “Exercises for Your Eyes”, https://www.newmantherapyservices.com/exercises-for-your-eyes/, accessed February 8, 2025

 

Peter; “Peripheral Vision Training”, June 28, 2024, https://www.eye-hero.com/blog/peripheral-vision-training/, [Smart Optometry Ltd. ©], accessed February 8, 2025

 

Reflexion Admin; “How To Improve Peripheral Vision With Simple Exercises”, June 1, 2020, [© 2023 Reflexion Interactive Technologies, Inc.], https://reflexion.co/blog/how-to-improve-peripheral-vision/, accessed February 8, 2025

 

Sports Vision Training; “What Are the Best Exercises to Train Peripheral Vision?”, https://sportsvisiontrainingmn.com/what-are-the-best-exercises-to-train-peripheral-vision/, accessed February 8, 2025

 

Wikimedia, “Field of view for both eye - human binocular vision”, November 9, 2014, by Zyxwv99, https://commons.wikimedia.org/wiki/File:FOV_both_eyes.svg, accessed February 8, 2025

 

Wikimedia, “Vertical field of view of the human eye”, November 2, 2014, by Zyxwv99, https://commons.wikimedia.org/wiki/File:Vertical_FOV.svg, accessed February 8, 2025

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