Abnormal brain function in photophobic patients with dry eye disease: An fMRI study

Area of Science:

• Neuroscience
• Ophthalmology
• Medical Imaging

Background:

• Photophobia is a common, disabling symptom in neurological and eye conditions.
• Maladaptive brain functioning is hypothesized to underlie photophobia.
• Dry eye disease (DED) is frequently associated with photophobia.

Purpose of the Study:

• To investigate brain functioning in photophobic patients with DED using functional magnetic resonance imaging (fMRI).
• To compare brain activity and connectivity in DED patients with photophobia against healthy controls.

Main Methods:

• A prospective, comparative cohort study involving 11 photophobic DED patients and 8 healthy controls.
• fMRI scans were performed under intermittent light stimulation.
• Analysis included univariate contrasts and functional connectivity methods to assess cerebral activations.

Main Results:

• Photophobic DED patients showed stronger occipital cortex activation and less superior temporal cortex deactivation during light stimulation compared to controls.
• Functional connectivity analysis revealed reduced decoupling between the occipital cortex and salience/visual networks in patients.

Conclusions:

• DED patients with photophobia demonstrate maladaptive brain anomalies, including visual cortex hyperactivity and aberrant functional connectivity.
• These neural anomalies resemble those seen in tinnitus, hyperacusis, and neuropathic pain.
• Findings support the development of neurally-oriented treatments for photophobia.