Optical Coherence Tomography Angiography: Investigating Vessel Density Changes Induced by Caffeine in Healthy...

Area of Science:

• Ophthalmology
• Cardiovascular Science
• Pharmacology

Background:

• Caffeine is a widely consumed psychoactive substance with known vascular effects.
• Previous research on caffeine's impact on retinal vasculature is limited and contradictory.
• Understanding caffeine's effects on ocular blood flow is crucial for eye health.

Purpose of the Study:

• To evaluate the impact of 200 mg caffeine on blood pressure and retinal vessel density (VD).
• To assess changes in systolic blood pressure (SBP) and diastolic blood pressure (DBP) post-caffeine.
• To measure retinal VD using optical coherence tomography angiography (OCTA).

Main Methods:

• A prospective, randomized, double-blind, placebo-controlled study.
• 59 healthy low caffeine consumers (<136 mg/day) received either 200 mg caffeine or placebo.
• OCTA scans and blood pressure measurements were taken at baseline and 120 minutes post-intervention.

Main Results:

• Caffeine consumption significantly increased SBP and DBP compared to placebo after 2 hours.
• No significant differences in retinal vessel density (VD) were observed between caffeine and placebo groups.
• OCTA findings remained consistent across different scan sizes (3x3mm and 6x6mm) and locations (macula, optic nerve head).

Conclusions:

• A 200 mg dose of caffeine elevates blood pressure but does not alter retinal vessel density in healthy individuals.
• The study highlights a complex interplay between caffeine, blood pressure, and retinal vascular dynamics.
• Further investigation is warranted to explore caffeine's ocular health implications, particularly in patients with vascular conditions.