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Light Sensitivity
Light sensitivity is usually a brain sensitivity, not only an eye problem. We look at cranial nerve and vestibular function, pupil control, concussion, migraine, and neuroinflammation.
What you may be noticing
Bright lights feel painful. Fluorescent lights in stores, headlights at night, and screen glare trigger headaches, nausea, or exhaustion. You may wear sunglasses indoors or dim every screen. Light sensitivity often travels with blurred vision, dizziness, migraine, concussion, anxiety, or dry eye.
Sudden severe light sensitivity with fever, stiff neck, severe headache, or eye pain needs emergency care. New light sensitivity after a head injury needs medical evaluation.
Why it is rarely one thing
Light sensitivity is often less about the eye and more about the brain. Specialized light-sensing cells in the retina send brightness signals to the thalamus, where they converge with the trigeminal pathways that carry head pain. In migraine, after concussion, and with neuroinflammation, these pathways become hypersensitive and turn the volume up.
I place light sensitivity in the neurological bucket and address it with the same cranial nerve and vestibular approach I use for dizziness and blurred vision. Pupil control depends on a balance between parasympathetic constriction and sympathetic dilation, so a nervous system stuck in stress lets in more light than you need. Eye movement, convergence, and visual-vestibular mismatch add strain.
Neuroinflammation has three main upstream drivers in my framework: injury, infection, and toxins. Mold and other biotoxins are common, often overlooked contributors when light sensitivity comes with fatigue and brain fog. Low magnesium, poor sleep, and blood sugar swings raise neural excitability. Not only bright light, but a brain asking for regulation.
Patterns we look for
- Pupil light reflex speed and autonomic balance.
- Saccades, pursuit, convergence, and gaze stability.
- Vestibular function and visual-vestibular integration.
- Concussion history and head and neck injury.
- Migraine patterns and trigeminal sensitization.
- Neuroinflammation from injury, infection, or toxins, including mold.
- Sleep, circadian rhythm, and morning light exposure.
- Magnesium, riboflavin, and vitamin D status.
- Dry eye and medications that dilate the pupils.
How I evaluate it
The comprehensive functional neurological exam assesses pupil responses and their timing, cranial nerves, saccades, pursuit, convergence, vestibulo-ocular reflex tolerance, and autonomic balance, revealing how your brain processes light.
Functional labs may include magnesium, vitamin D, B vitamins, inflammatory markers, and a thyroid panel, with mold and biotoxin testing when the history fits. After head injury or with cognitive changes, volumetric brain MRI can add objective information. I coordinate with your eye care provider to rule out eye disease and with your physician when imaging is needed.
How we address it
- Rule out eye disease and urgent neurological causes.
- Calm first: breath, vagal tone, and autonomic regulation before visual challenge.
- Retrain pupils, eye movements, and visual-vestibular integration with brain-based exercises, always below your symptom threshold, in short, frequent sessions.
- Lower neuroinflammation by addressing injury, infection, and toxic burden, opening drainage before any detox.
- Reduce neural excitability with magnesium, sleep restoration, and blood sugar stability.
- Use tinted lenses strategically rather than constant darkness.
- Anchor the circadian rhythm with gentle morning outdoor light.
Living in constant dimness can make the brain more sensitive, not less. Gradual, guided exposure lets the visual system recalibrate, and regulation precedes endurance.
As the brain settles, light can become something you enjoy again.
Book your Comprehensive Functional Medicine Eval/Neurological Exam today to discover what the contributing root causes are that are underlying your health concerns.