Lower Cognitive Function in Patients With Functionally and Structurally Severe Glaucoma: The LIGHT Study

Area of Science:

• Ophthalmology
• Neurology
• Gerontology

Background:

• Glaucoma is a progressive optic neuropathy often associated with elevated intraocular pressure.
• Cognitive impairment is a growing concern, particularly in aging populations.
• The potential link between glaucoma and cognitive decline warrants further investigation.

Purpose of the Study:

• To investigate the association between functional and structural glaucoma damage and cognitive function.
• To determine if glaucoma severity impacts cognitive impairment.
• To explore the relationship independent of age and visual acuity.

Main Methods:

• A cross-sectional study of 172 glaucoma patients (mean age 70.6 years).
• Functional severity assessed by visual field mean deviation (MD).
• Structural severity assessed by circumpapillary retinal nerve fiber layer thickness.
• Cognitive impairment defined by Mini-Mental State Examination (MMSE) and MMSE-blind scores.

Main Results:

• Higher prevalence of cognitive impairment in severe glaucoma patients (33.3% vs. 15.7% for MMSE ≤26).
• Severe glaucoma associated with a 2.62-fold increased odds of cognitive impairment (P=0.049).
• 10-μm thinning of retinal nerve fiber layer increased odds of cognitive impairment by 1.42 (P=0.025).

Conclusions:

• Functional and structural glaucoma damage are significantly associated with cognitive impairment.
• This association is independent of age and visual acuity in glaucoma patients.
• Findings suggest a potential shared pathophysiology or systemic impact of glaucoma on cognition.