Light Sensitivity After Concussion: Causes, Treatment, and Recovery Timeline

Light Sensitivity After Concussion: Causes, Treatment, and Recovery Timeline

Light sensitivity after concussion is also called “photophobia,” which translates to fear of light. It is one of the most common symptoms I see in my neuro-ophthalmology practice.

Patients often tell me:

• “Bright light feels painful.”

• “Screens make me nauseous.”

• “I need sunglasses indoors.”

If this sounds familiar, you’re not imagining it.

Why Light Sensitivity Happens

After a concussion, the brain’s sensory processing pathways become dysregulated. Specialized retinal cells that detect brightness send signals to brain centers involved in pain and sensory integration. When these pathways become hypersensitive, normal light levels can feel overwhelming.

The trigeminal nerve, also known as Cranial Verve V, is a complex nerve found deep inside the brain. It has many branches, including those that go to the eye, the eye socket, the face, and the covering of the brain.

The trigeminal nerve carries pain and eye discomfort signals to the sensory relay centers in the brain, and is often triggered after head injury. That’s why light sensitivity may feel intense after concussion, even when the eye itself appears normal.

Where Macular Carotenoids Come In

As an integrative neuro-ophthalmologist, I also think about the retina’s role in filtering light.

The eye’s 3 macular carotenoids - lutein, zeaxanthin, and meso-zeaxanthin - act as natural blue light filters in the retina. They help absorb high-energy blue wavelengths before they trigger excessive oxidative stress or sensory overstimulation.

In patients with concussion-related light sensitivity, especially screen intolerance, supporting macular pigment density may help improve visual comfort over time.

That’s one reason I formulated my signature eye supplement, FORTIFY, which contains therapeutic levels of all 3 macular carotenoids along with antioxidants that support retinal resilience and help combat digital eye strain. 

I recommend that my concussion patients with light sensitivity take FORTIFY for at least 3 months, to support the ability of their retinal cells to filter out potentially triggering wavelengths of light, and thus help reduce symptoms of light sensitivity.

>> You can learn more about FORTIFY HERE >>

**Though FORTIFY is not a treatment for concussion,  it can support visual comfort in patients struggling with screen-related light sensitivity.

What Else Helps With Light Sensitivity?

• Instead of blue blocking glasses, use a screen filtering software called Iris to modulate blue light and the eliminate screen flicker, which is a major trigger for light sensitivity

• Gradual light re-exposure (NOT total avoidance with dark sunglasses)

• Treating dry eye if present

• Regulating sleep and migraine triggers

  
  

The Bottom Line

Light sensitivity after concussion is a common symptom and neurologic in origin. However, retinal resilience and light filtering play important supportive roles. The good news is that over time, post-concussion light sensitivity can and does improve, with the right strategies and support. 

Next week, we’ll explore post-concussion headaches and migraines—and how to best manage them.