NCT06235827

Effects of Green Tea Consumption on Primary Glaucoma

Effects of Green Tea Consumption on Retinal Nerve Fiber Layer ( RNFL) and Intraocular Pressure ( IOP) in Patients With Primary Glaucoma

• Status: Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 100 (estimated)
• Sponsor: Universiti Sains Malaysia · Academic / Other
• Sex: All
• Age: 18 Years – 80 Years
• Healthy volunteers: Not accepted

Summary

The goal of this randomised control trial is to learn about the effect of green tea consumption on patients with primary glaucoma. The main questions to answer are: 1. Is there any difference of intraocular pressure (IOP) in patient with primary glaucoma after 1 month, 3 months and 6 months who is consuming green tea compared to patient not consuming green tea? 2. Is there any difference of retina nerve fibre layer in patient with primary glaucoma after 1 month, 3months and 6 months who is consuming green tea compared to patient not consuming green tea? Researchers will compare patients with primary glaucoma who are consuming green tea and normal daily drinking to see if any affect to intraocular pressure and retina nerve fibre layer.

Detailed description

Glaucoma is a progressive optic neuropathy characterised by loss of retinal ganglion cells (RGCs) with corresponding visual field loss. The current established treatment of glaucoma is by reducing IOP, as one of neuroprotectant factor to prevent further loss RGCs. However, it is not always sufficient to fully prevent disease progression. Oxidative stress is one of biological insult contribute to etiology and progression of glaucoma. Antioxidants represent the first line of defence against oxidative stress and are obtained through the diet and produced internally has shown to be protective towards glaucoma. Green tea is one of the most antioxidant rich drink due to its high content of flavonoids commonly known as catechins. The investigator would like to evaluate the effect of 6 months consumption of green tea on intraocular pressure (IOP) and retinal nerve fibre layer thickness (RNFL) in patients with primary glaucoma. This is a randomised controlled study involving primary glaucoma patients who are attending ophthalmology clinic at Hospital Universiti Sains Malaysia. Evaluation of study sample includes baseline ocular examination, IOP and Optical Coherence Tomography Retinal Nerve Fibre Layer (OCT RNFL). Subjects who fulfil the inclusion and exclusion criteria for the study will be selected. Patients in Group A will consume two cups per day (250ml for each cup) of hot green tea, five days per week for 6 months while other Group B (control group) will not consume green tea. IOP and OCT RNFL measurement will be taken at baseline, first month, 3rd month and 6th month post recruitment of subjects. All patients will be given dietary diary to note down their daily drinks' consumption.

Conditions

• Primary Glaucoma

Interventions

Type	Name	Description
DIETARY_SUPPLEMENT	Green tean group	Patients in Group A will have to consume two cups (250ml for each cup) of hot green tea, five days per week for 6 months. A tea bag is brewed in 250ml hot water for 3 minutes. They are only allowed to consume as hot drink, not for iced tea. Any sweetener or sugar is not allowed to mix in the drink. The green tea bag will be distributed to patient at beginning of research and at every visit. Patient will be reminded weekly using text messages or phone call by a research assistant for green tea consumption.
DIETARY_SUPPLEMENT	Control group	Patients in Group B will not be consuming green tea during 6 months of study period.

Timeline

• Start date: 2024-02-01
• Primary completion: 2024-12-01
• Completion: 2025-06-01
• First posted: 2024-02-01
• Last updated: 2024-05-08

Locations

1 site across 1 country: Malaysia