Episode 178: Vagus Nerve and Vision: How Your Eyes Signal Safety to Your Nervous System
- 11 hours ago
- 11 min read
Two-thirds of the neurons entering your brain come from your eyes. Vision is one of the largest signals your nervous system reads for safety. Under stress, peripheral vision collapses. The vagus nerve loses a primary safety input. The world starts to feel smaller. Your body starts to brace.
Most people never link the eye-brain pathway to nervous system regulation. Neuro-optometrist Dr. Bryce Appelbaum walks through how the vagus nerve and your eyes work together. He explains why vision problems can keep triggering old attachment wounds. He shares three eye exercises that retrain your vagus nerve and your sense of safety
“Our eyes are actually extensions of our brain. They're part of our brain that in utero separate from our brain.”
- Dr. Bryce Appelbaum
Vision is one of the primary signals your nervous system reads for safety or danger. Under stress, peripheral vision collapses and the body locks into central focus. Dr. Bryce Appelbaum walks through three eye exercises that begin retraining the eye-brain connection and the felt sense of safety.
Key Takeaways
Two-thirds of the neurons entering your brain come from your eyes
The vagus nerve connects directly to pupil regulation and eye muscle control
Peripheral vision collapses under stress, which is autonomic dysfunction made visible
Vision problems can keep triggering old attachment wounds in adults
Vision is a developed skill that depends on consistent early caregiving
Old concussions can affect vision biology for years or decades
Soft gaze and peripheral awareness activate parasympathetic tone
Dr. Bryce demonstrates three eye exercises that retrain the eye-brain connection
Screens lock the visual system into a tunneled fight-or-flight pattern
The eyes are extensions of the brain that separated in utero
In This Episode You'll Learn:
01:33 — What is neuro-optometry, and how is it different from a regular eye exam?
03:58 — How do your eyes shape how you move through the world?
14:17 — Can an old concussion still be affecting you years later?
23:21 — How does early caregiving shape vision development?
33:43 — Eye exercise 1: How do you do peripheral pointing?
41:36 — Eye exercise 2: How do you do eye push-ups?
46:38 — Eye exercise 3: How do you do eye stretches and the 20-20-20 rule?
50:18 — What foods support eye and brain health?
Notable Quotes
“Two-thirds of the neurons entering your brain come from your eyes.”
“Vision is literally how we construct our experiences of the world, neurologically, not just metaphorically.”
“If we have a difficult time controlling our eyes and ability to focus, we're going to have a much harder time to control our mind and its ability to focus.”
Episode Takeaway
What Dr. Bryce shared adds another piece to what the body keeps telling us.
The nervous system speaks to every part of us, including our eyes. Vision is a direct route to a felt sense of safety or danger. Two-thirds of the neurons entering the brain come from the eyes. That is a lot of information your neuroception is constantly reading.
When the body shifts into fight or flight, peripheral vision collapses. The world feels smaller. The chest gets tighter. This is autonomic dysfunction made visible.
Opening peripheral vision back up gives the body a different signal. It tells the nervous system that there is space, that you can be present, that you do not need to retreat. The vision biology and the safety biology are the same biology.
Your eyes are part of your brain. They separated in utero from the same tissue. Caring for one is caring for the other.
This is the same chronic functional freeze biology we see in so many other places. Light sensitivity. Screen fatigue. The retreat into the back of the room. The "I don't want to drive at night anymore." These are not personality traits. They are adaptations.
If you carry an old concussion, or grew up with attachment patterns that taught your body to scan, or live with the kind of screen exposure most of us live with now, this episode gives a path your body can walk.
Resources/Guides:
The Biology of Trauma® Professional Certificate Training trains health and helping practitioners in the same framework Lacey works from. If this episode resonated with how you want to work with clients, this is the path.
Looking for a practitioner who works with this framework? The directory lists certified Biology of Trauma® Professionals worldwide, including Lacy Suby.
ScreenFit™ online vision training program — $200 off with code DrAimie at screenfit.com/enroll
Digital Performance Lenses — 10% off with code DrAimie at shop.myvisionfirst.com
Instagram: @drbryceappelbaum
Related Podcast Episodes:
About the Guest: Dr. Bryce Appelbaum is a pioneer in neuro-optometry. He founded MyVisionFirst, a clinical practice in Bethesda and Annapolis, Maryland. He created Vision Performance Training, a method that retrains the eye-brain connection. He is also the founder and CEO of ScreenFit, the online vision training program. He has worked with thousands of patients worldwide, from children to professional athletes. His work has been featured on the front page of USA Today. He has appeared on NBC, CBS, and in The New York Times Sunday Magazine. He is an international TEDx speaker. His work focuses on how vision shapes brain function, nervous system regulation, and human potential.
Your host: Dr. Aimie Apigian is a double board-certified physician in Preventive and Addiction Medicine, author of the national bestselling book The Biology of Trauma (foreword by Gabor Maté) and the founder of the Biology of Trauma® framework that transforms our understanding of how the body experiences and holds trauma. She holds master's degrees in biochemistry and public health. After foster-adopting a child during medical school sparked her journey, she desperately sought for answers that would only continue as she developed chronic health issues. Through her Biology of Trauma® practitioner training, podcast, YouTube channel, and international speaking, Dr. Aimie bridges functional medicine, attachment science, and trauma therapy — with a focus on facilitating accelerated repair of trauma's impact on the mind, body, and biology.
Why does your peripheral vision collapse under stress?
Under fight or flight, your pupils dilate and peripheral vision narrows. Your nervous system locks into central focus on the perceived threat.
When your nervous system shifts into a survival state, your visual system shifts with it. Pupils widen. Peripheral processing collapses. Central vision takes over. Dr. Bryce calls this evolutionary response the saber-tooth-tiger setting. It was designed for brief moments of real danger.
Modern life keeps that response running. Screens, deadlines, traffic, financial pressure, parenting load. The body cannot always tell the difference between a sustained stressor and a real one. So the visual system stays tunneled. Over time, the brain adapts to that tunneled state as its default.
This is one of the reasons people who carry stored trauma describe feeling like they are looking through paper towel rolls. The world has literally narrowed. Mental health spirals because the body is reading a smaller world as a less safe one.
How does vision shape the felt sense of safety?
Two-thirds of neurons entering your brain come from your eyes. Vision is a primary input neuroception uses to calculate safety or danger.
Neuroception is the term Dr. Stephen Porges coined for the nervous system's background scan for cues of safety and danger. It is your body's threat detection running underneath conscious awareness. Vision feeds neuroception more data than any other sense.
This is why opening peripheral vision can shift you into a parasympathetic state. Soft eyes, broad gaze, panoramic awareness. These signal to the body that there is space, that no threat is locked in front of you. The vagus nerve gets the message. Heart rate slows. Breathing deepens.
When vision is collapsed and locked, that message never arrives. The body keeps the alarm bells on.
What is neuro-optometry, and how is it different from a regular eye exam?
Neuro-optometry focuses on the connection between your eyes and brain. It addresses how visual skills develop, integrate, and influence the nervous system.
A regular eye exam checks eyesight: can you focus light clearly onto the retina, can you read the smallest letters on the chart. That is one dimension of vision.
Neuro-optometry checks function: how your eyes move, track, team, focus, and process information. It looks at depth perception, eye coordination, and how visual input integrates with the rest of the brain. Vision lives in every lobe of the brain. More than half of the brain's processing real estate is dedicated to vision.
Standard eye exams catch refractive errors. Neuro-optometry catches the functional vision problems that lock people into fatigue, brain fog, light sensitivity, reading difficulty, and social withdrawal, even when their eyesight is technically 20/20.
Can an old concussion still be affecting your nervous system?
Vision symptoms may improve after a concussion, but functional vision problems often persist. The brain learns to compensate rather than fully recover.
Dr. Bryce shared a statistic from the National Institutes of Health: 28% of Americans have had at least one concussion in their lifetime. He suspects the real number is closer to double that, because most concussions never get formally diagnosed. The fall on the playground. The bump on the kitchen countertop. The car accident that left you "fine, just shaken."
Functional vision problems can persist for weeks, months, years, or decades after the event. The brain bypasses what it cannot use and reorganizes around the gap. Present-day symptoms often trace back to an old head injury that was never connected to current vision struggles.
Vision performance training and neuro-optometric rehabilitation can retrain those skills. Dr. Bryce's clinic dedicates about 60% of its work to concussion recovery.
What does screen overload do to the eye-brain connection?
Screens force tunneled central focus that mimics a fight-or-flight state. Sustained near-focus locks the visual system and depletes nervous system resources.
Every minute on a screen is a minute your eyes are locked in close, central focus. The visual system never gets to scan, soften, or rest. Dr. Bryce calls screens toxic to the nervous system, not because of the device but because of what sustained near-focus does to the brain.
The 20-20-20 rule helps. Every 20 minutes of near work, look at something at least 20 feet away for at least 20 seconds. Ideally outside. Ideally with a brief movement break.
Without those breaks, the system runs flat. People reach for the third or fourth cup of coffee at 2 PM. Brain fog sets in. Comprehension drops. Productivity drops. None of this is a willpower problem. It is a vision biology problem.
How does early caregiving shape vision development?
Consistent caregiving teaches the brain object permanence, size constancy, and face reading. Inconsistent early care can impair eye movement control later in life.
Vision is not innate. We are not born with the ability to see in 3D, read social cues from faces, or track moving objects with both eyes. These are developed skills, built through the right sequence of developmental milestones in the first years of life.
Babies given screens instead of faces miss part of that sequence. Children in orphanages or in chaotic early-caregiver environments often show significantly impaired eye movement control as adults. The visual system did not get the inputs it needed to organize.
Dr. Bryce works with adults who never developed the ability to perceive things from someone else's point of view. They could not learn playbooks, could not read defensive plays in sports, could not always read what was happening on someone else's face. The same neuroplasticity that built the deficit can rebuild the skill.
What three eye exercises retrain the nervous system?
Peripheral pointing opens side vision. Eye push-ups train near-far focus. Eye stretches loosen rigid eye muscles. Each exercise pairs vision with regulation.
These are three simple practices Dr. Bryce demonstrated live in the episode.
Peripheral pointing. Look at a fixed point across the room. Without moving your eyes, notice something in your periphery. Point to where you think it is. Then move your eyes to check your accuracy. Practice in all directions: left, right, diagonals. This rebuilds peripheral awareness and grounds the body in space.
Eye push-ups (near-far focus). Cover one eye. Hold your thumb up in front of the open eye. Bring it close until it gets slightly blurry, then hold and try to clear the image. Look at the distance for five seconds. Back to your thumb for five seconds. Repeat. This builds focusing stamina and flexibility.
Eye stretches. Cover one eye. Look as far up as you can hold steadily. Five seconds. Down. Right. Left. Up-left, up-right, down-left, down-right. Switch eyes. This loosens rigid eye muscles and calms the nervous system.
Two minutes a day of these can shift how the visual system supports your regulation.
Why is vision a Biology of Trauma® issue?
Vision collapses with autonomic dysfunction. Peripheral retreat is disconnection made visible. Eye-brain patterns reflect the same chronic functional freeze biology found elsewhere.
The five patterns of stored trauma (Disconnection, Disruption, Depletion, Dysregulation, and Disease) all live in the body. Vision is one of the places they live visibly.
Disconnection shows up as the retreat from peripheral awareness, the withdrawal from eye contact, the egocentric "I can only see the world from my own seat" pattern. Dysregulation shows up as the constant scanning, the hypervigilant inability to land on anything, the tunneled focus under stress. Depletion shows up as the energy crash from sustained near-focus. Disease shows up in the neuroinflammation that follows concussion, Lyme, and chronic systemic stress.
The eye-brain connection is not separate from the body-trauma loop. It is one of its clearest readouts. Working with vision becomes one path back into the felt sense of safety.
FAQ
How does the vagus nerve connect to my eyes?
The vagus nerve is the main pathway of parasympathetic regulation. It influences pupil size, tear production, and eye muscle control. When you soften your gaze, peripheral vision opens up. That change signals safety back to the brainstem. The vagus nerve responds: heart rate slows and breathing deepens.
Why does my vision tunnel when I'm anxious?
When your nervous system shifts into fight or flight, peripheral vision narrows. Your pupils dilate and the visual system locks into central focus. This was designed for brief moments of real danger. Modern stressors keep this response running. Over time the brain adapts to that tunneled state as its default.
How do I reset my vagus nerve with my eyes?
Three eye practices work directly with the vagus nerve. Peripheral pointing opens side vision and broadens peripheral awareness. Eye push-ups train the focusing system through near-far focus changes. Eye stretches loosen rigid eye muscles in all directions. Soft gaze and panoramic awareness signal safety to the brainstem and activate parasympathetic tone. Two minutes a day can begin to shift your autonomic state.
What are soft eyes and do they work?
Soft eyes is a practice of relaxing your gaze and broadening peripheral awareness. It happens when your gaze stops locking into central focus under stress. The practice activates the parasympathetic nervous system through the vagus nerve. Research on cardiac vagal tone shows higher vagal regulation correlates with better visual processing of safety cues. The biology is real. The eye-brain pathway is one of the most direct routes into vagal regulation.
Can eye exercises calm my nervous system?
Yes. Eye exercises that engage peripheral vision, soft gaze, and near-far focus calm the nervous system. They activate parasympathetic tone through the vagus nerve. Two minutes a day of peripheral pointing can shift your autonomic state. Eye push-ups and eye stretches deepen the effect. Eye exercises work by retraining the eye-brain pathway that signals safety to your body.
Helpful Research:
Park G, Van Bavel JJ, Vasey MW, Egan EJL, Thayer JF. From the heart to the mind's eye: Cardiac vagal tone is related to visual perception of fearful faces at high spatial frequency. Biological Psychology. 2012 May;90(2):171-178.
Master CL, Scheiman M, Gallaway M, Goodman A, Robinson RL, Master SR, Grady MF. Vision Diagnoses Are Common After Concussion in Adolescents. Clinical Pediatrics (Phila). 2016 Mar;55(3):260-267.
Gonçalves JL, Fuertes M, Silva S, Lopes-dos-Santos P, Ferreira-Santos F. Differential effects of attachment security on visual fixation to facial expressions of emotion in 14-month-old infants: an eye-tracking study. Frontiers in Psychology. 2024 Feb 1;15:1302657.
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