The Nervous System Connection
What you're experiencing is, at its core, a condition of neural hyperexcitability. Your brain's visual processing centers are stuck in a heightened state, amplifying signals that should be filtered out.
Think of it like this: your brain has a noise filter, and right now, it's turned way down. Every signal gets through — the static, the afterimages, the light sensitivity. The exact cause is still unknown, but all symptoms appear to be caused by hypersensitivity to the sensory inputs of the body — where other people's brains normally filter out this information, yours cannot.
This can lead to unwanted sensations not only in the eyes, but also the ears (Tinnitus) and the skin (Tingling Sensations). Many people also experience Depersonalization/Derealization, because the brain is expecting a different reality from the filter system and cannot match it with its previous experience. For why labels can actually work against your recovery, read Breaking the Fear-Symptom Cycle.
But here's the crucial insight: your visual processing doesn't exist in a vacuum. It's deeply intertwined with your Autonomic Nervous System (ANS) — the system that controls every automatic function in your body, from your heartbeat to your digestion to your stress responses.
Polyvagal Theory — The Framework That Changed Everything
The framework that gave me the deepest understanding of what was happening in my body is Polyvagal Theory, developed by Stephen Porges, PhD. Rather than treating the nervous system as a simple on/off switch (stressed vs. relaxed), Polyvagal Theory explains how the autonomic nervous system continuously organizes your entire physiological state — heart rate, breathing, muscle tone, sensory processing — based on whether it detects safety or threat. These adjustments happen automatically, outside of conscious awareness, and they shape how you feel, how you think, and how you relate to others.
This is the missing piece: your visual processing, your anxiety, your depersonalization — these aren't random symptoms. They're direct expressions of which nervous system state you're in.
I highly recommend the book Anchored by Deb Dana — it translates Polyvagal Theory into clear, practical language that anyone can understand and apply. It's the best resource I've found for learning to befriend your nervous system and become an active operator of this essential system. The Polyvagal Institute also has excellent educational resources.
Your Nervous System as an Engine
The ANS operates like a car engine with different pedals and brakes. Understanding these three circuits — as described by Polyvagal Theory — changed everything for me:
The Gas Pedal (Sympathetic Branch) — This mobilizes energy for action. When danger is detected, it revs the engine into fight-or-flight mode. Heart rate accelerates, breathing quickens, adrenaline floods your system.
The Soft Brake (Ventral Vagus Nerve) — Part of the parasympathetic branch, this is your body's natural brake pedal. It keeps the engine from overreacting, slows your heart rate, and enables your Social Engagement System. When this brake is online, you feel safe — at a cellular level.
The Emergency Brake (Dorsal Vagus Nerve) — Also parasympathetic, but this one is pulled as a last resort. When stress becomes overwhelming and there's no way to fight or flee, this hard brake induces a freeze or shutdown response — while the gas pedal is still pressed to the floor underneath.
The Three Zones of Activation
Think of your nervous system like a temperature gauge that's constantly being monitored. At any given moment, you're in one of three zones:
The Safety Zone
When the soft brake is running the show, your body is in metabolic balance. Digestion works properly, your immune system functions well, and your heart rate is slow and steady. Emotionally, you feel open, curious, connected. You can feel joy, empathy, and playfulness. If a minor stressor comes along, you can handle it — maybe with humor, maybe by reaching out to someone you trust.
This is where healing happens. Your visual cortex can start to recalibrate when your nervous system feels genuinely safe.
The Danger Zone
As threat signals increase, the soft brake releases and the gas pedal is pressed. Adrenaline and cortisol pump through your body, blood diverts to large muscles, and digestion shuts down. At the lower end, you might feel mild worry, frustration, or irritability. As it escalates: anxiety, fear, panic, even rage.
When you're stuck in this zone, it's particularly damaging to sensory processing:
- Pupils dilate — making you more light-sensitive
- Visual cortex becomes hyperactive — amplifying the "noise"
- Attention narrows — you hyperfocus on symptoms
- Stress hormones keep everything on high alert
The Overwhelm Zone
If stress hits a tipping point where fighting or fleeing feels impossible, the emergency brake is pulled. Your body enters a state of conservation and shutdown — heart rate and breathing slow drastically, your physical sense of the body becomes dull. But all that intense sympathetic arousal remains locked underneath.
You might feel disconnected, dissociative, or "fuzzy." Physically present but not mentally engaged. This is the freeze response — feeling helpless, unable to speak or make decisions.
Hidden Survival Responses
Survival responses don't always look like obvious panic or freezing.
Hidden fight/flight can show up as staying constantly busy, compulsively fixing things, or anxiously taking care of everyone around you. If you can't sit still, if you're always rushing from task to task — that might be your nervous system in disguise.
Hidden freeze can look like numbing out through excessive screen time, overeating, or substance use. It can also appear as "fawning" — compulsively agreeing and complying to keep the peace, especially if you've experienced situations where you felt powerless.
Why Symptoms Get Stuck
A healthy nervous system flows smoothly between these zones throughout the day — encountering stressors, resolving them, and settling back into safety. But modern stressors are chronic and unrelenting. Financial worries, relationship struggles, health anxiety — they don't resolve.
Over time, these unresolved stress signals cause your nervous system's baseline to creep higher up the temperature gauge. As your baseline settles permanently into the Danger or Overwhelm zones, your window of tolerance shrinks. Minor everyday challenges can push you into extreme reactivity or shutdown. And your visual processing system? It stays hyperexcitable, stuck in that heightened state.
A lot of people have developed their symptoms after an extensive period of stress and exhaustion. The nervous system becomes stuck in overdrive, and the sensory symptoms are an expression of that hyperarousal — not a permanent hardware problem.
Neuroplasticity — Your Path Out
The good news? Your nervous system is not a fixed machine. It's incredibly plastic and responsive to the right inputs. Neuroplasticity means your brain can literally rewire itself — forming new neural pathways and weakening old ones. The same mechanism that made your brain hypersensitive can be used in reverse to calm it back down.
Brain Retraining: Catch — Breathe — Visualize
One of the most practical neuroplasticity techniques is a 3-step pattern interrupt that you can use throughout the day. It's based on the work of researchers and programs like DNRS, the Gupta Program, and insights from Joe Dispenza and Norman Doidge:
Step 1 — Catch. Recognize when negative thought patterns or symptom-focus are running. The moment you catch yourself spiraling — "this will never get better," "my symptoms are worse today," "what if this is permanent" — that recognition alone creates distance. You are not those thoughts. You're the one observing them.
Step 2 — Breathe. Interrupt the pattern by dropping from your head into your body. Take 2-3 slow breaths, exhaling longer than you inhale. Move your attention out of the mental loop and into physical sensation — your feet on the floor, the air in your lungs, your hands in your lap. This breaks the cycle.
Step 3 — Visualize. Here's the key insight: your brain cannot tell the difference between what's actually happening and what you're vividly visualizing. Your limbic system — the survival brain — responds to mental imagery as though it were real. So replace the fear film with a positive one. Visualize yourself doing something you love, in as much sensory detail as possible — the sights, sounds, smells, textures, feelings. Really embody the best version of yourself in that moment.
When you've been running the "horror film" — focusing on symptoms, reading scary forum posts, catastrophizing — your nervous system responds as if the threat is real. Flip the film. Run the one where you're at peace, in nature, doing what you love. Your nervous system will respond to that too.
Use this throughout the day whenever the negative loop starts. Morning is especially important — fear tends to hit hardest when you first wake up and your mind's overnight rumination surfaces all at once. Have your interrupt ready: catch, breathe, visualize. Then get moving — put on uplifting music, do your morning routine, step outside.
Tools for Nervous System Regulation
Building resilience must happen slowly and cumulatively. These tools help shift your baseline back toward safety.
The Safety Scale
Your foundation for tracking progress. Close your eyes, turn your attention inward, and rate your current feeling of ease and safety from 1 (high distress) to 10 (completely at ease). Go with the first number that comes to mind. Track this throughout the day — before and after each practice — to see what actually moves the needle for you.
Orienting and Focusing
These techniques prove to your nervous system that it's safe and supported:
- External orienting: Slowly look around your environment, letting your gaze settle on something pleasant or neutral. Stay with it for 3-4 breaths, noticing details. Check your Safety Scale.
- Internal orienting: Close your eyes and find a neutral or pleasant sensation in your body — feet on the floor, back against the chair. Hold your attention there for 3-4 breaths.
- Tactile focusing: Hold a small object — a stone, a tennis ball — and really feel its weight, texture, contours. This grounds you through touch.
Shifting Focus
This powerful technique builds your capacity to tolerate discomfort:
- Find a neutral or pleasant body sensation (feet on the floor) and rest there for 4-5 breaths
- Shift your attention to the area of pain or anxiety — but only for one breath
- Return to the neutral sensation for several breaths
- Continue shifting back and forth, noticing if the distressing sensation softens over time
This is particularly useful for managing the anxiety and hyperawareness that comes with sensory symptoms — you're teaching your nervous system that distress is manageable without going into full activation.
Vagus Nerve Stimulation
The vagus nerve is your body's "rest and digest" superhighway — the soft brake itself. Activating it sends a clear signal to your brain: "We are safe."
- Cold showers — start with 30 seconds of cold at the end of a warm shower. This tones the vagus nerve and calms the nervous system immediately. Over time, build up to 1-2 minutes. If you're in panic or your symptoms feel out of control, jump in a cold shower — it works fast
- Humming or singing — vibrates the vagus nerve directly through the throat and chest
- Gentle yoga — especially inversions and forward folds
Progressive Muscle Relaxation (PMR)
Systematically tensing and releasing muscle groups teaches your nervous system what "relaxed" feels like. If you have pain in your muscles or tingling sensations on the skin, doing 10 minutes of PMR 1-2 times per day can be particularly beneficial. Practice it before bed for better sleep.
Sports & Movement
Any kind of physical activity is super important to release stress and alleviate symptoms. Whether it's gym, swimming, or home exercises — everything helps. Walking 30-60 minutes in nature during the day, connecting with the sounds of birds and trees, is one of the most powerful nervous system regulators available.
If your body is agitated with an urge to fight or flee, you can mindfully channel that energy: press your palms against a wall and push your body away, or sit with legs extended and mimic running by alternately bending your knees.
Somatic Experiencing
This approach helps release stored trauma and tension from the body. Working with a trained practitioner can be transformative. It's based on the understanding that trauma gets "stuck" in the body, and by gently working through it, the nervous system can return to its natural baseline. Learn more at the Somatic Experiencing International website.
Daily Nervous System Hygiene
Just like brushing your teeth, your nervous system needs daily care:
- Morning: 5 minutes of slow breathing before checking your phone
- Mid-morning: 12 minutes of gentle yoga to connect body and mind
- Afternoon: A 30-60 minute walk in nature, ideally without headphones
- Work breaks: 5 minute break every 50-60 minutes — stand up, let your eyes focus at different distances
- Evening: Screen-free wind-down — 10-20 minutes on an acupressure mat or progressive muscle relaxation
- Night: Consistent sleep schedule (8+ hours), dark and cool room
For a powerful body-based tool that releases stuck stress from the nervous system, read about TRE — Tension and Trauma Releasing Exercises. To build a daily toolkit of grounding practices that support nervous system regulation, see Grounding and Somatic Practices. And for a structured meditation practice that trains your brain toward calm, explore the Meditation Guide.