Purpose: This study aims to assess green tea's impact on intraocular pressure in patients with primary open angle glaucoma and healthy volunteers.

Methodology: Quasi experimental study design was conducted at Munawar Memorial Hospital, Chakwal. Convenient sample of 100 subjects with age between 40-65 years of both genders was included in this study. Sample was divided into two groups. Groups were made on the basis of present and absence of primary open angle glaucoma. The duration of the study was from September 2022 to May 2023. Informed consent was taken from the subjects. Demographic data and history was taken using specially designed proforma. Slit lamp examination was carried out to exclude any ocular pathology. Before drinking green tea, intraocular pressure was measured using Goldmann Applanation tonometer. Intraocular pressure was rechecked one and two hours after consuming green tea.

Results: Green tea reduced Intraocular Pressure in both groups, with p- value of 0.000 (p<0.05). The decrease in intraocular pressure after one hour in glaucoma subjects was 2.70+1.01 and 1.70+1.093, after two hours in same group it reduced significantly with a difference of 6.50+1.542 in right eye and 5.54+1.809 in right and left eye respectively. In healthy group after one hour it was 1.62+0.753 in right eye and 1.30+0.886 in left eye. But after two hours it had much better effect of 4.100+1.432 and 4.40+1.55 in right and left eye respectively.

Conclusion: After drinking green tea, there was a noticeable decrease in intraocular pressure. Intraocular pressure was reduced more significantly in glaucoma group.

Key words: Catechins, Green tea, Intraocular pressure, Polyphenols, Primary open angle glaucoma