Contrast sensitivity in Idiopathic Intracranial Hypertension

Area of Science:

• Ophthalmology
• Neuro-ophthalmology
• Visual Neuroscience

Background:

• Idiopathic Intracranial Hypertension (IIH) is characterized by elevated intracranial pressure of unknown cause.
• Visual dysfunction is a primary morbidity in IIH, yet its specific impact on contrast sensitivity (CS) remains under-investigated.
• Understanding CS alterations is crucial for managing IIH-related visual impairment.

Purpose of the Study:

• To prospectively evaluate changes in central and peripheral contrast sensitivity (CS) following treatment in patients with Idiopathic Intracranial Hypertension (IIH).
• To assess the efficacy of treatment in restoring contrast vision.
• To explore the potential role of CS as an indicator of visual dysfunction in IIH.

Main Methods:

• A prospective, interventional study involving 10 patients (20 eyes) diagnosed with IIH.
• Utilized an internet-based Spaeth Richman Contrast Sensitivity (SPARCS) test for assessment.
• Compared average and quadrant-wise SPARCS scores at baseline (treatment-naïve), 1 month, and 3 months post-treatment.

Main Results:

• Average SPARCS scores improved from 68.8 ± 10.16 at baseline to 75.7 ± 10.81 at 3 months post-treatment.
• At 3 months, average SPARCS scores approached levels observed in healthy Indian subjects.
• Significant improvements in quadrant-wise contrast sensitivity were noted in the superonasal, inferonasal, and inferotemporal areas.

Conclusions:

• Idiopathic Intracranial Hypertension (IIH) negatively affects both central and peripheral contrast sensitivity.
• Therapeutic interventions lead to significant improvement in contrast sensitivity deficits in IIH patients.
• The observed pattern of visual dysfunction may involve greater impairment of the Magnocellular pathway compared to the Parvocellular pathway.