ArticleClinical ophthalmology (Auckland, N.Z.)2019
The acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects.
Article in Clinical ophthalmology (Auckland, N.Z.), 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
17 citing papers in PubMed, 1 synthesis or guideline pooled it, 28 citations in OpenAlex.
- TFOS lifestyle: Impact of societal challenges on the ocular surface.The ocular surface · 2023Pooled it
- Alterations in the Crystallization Pattern of Tear Fluid Induced by Increases in the Body Mass Index.Life (Basel, Switzerland) · 2026Article
- The Immediate Effects of Different Types of Tea Consumption on Ocular Biometric and Specular Microscopic Parameters in Healthy Subjects.The Eurasian journal of medicine · 2025Article
- Microbiome as an endocrine organ and its relationship with eye diseases: Effective factors and new targeted approaches.World journal of gastrointestinal pathophysiology · 2024Review
- Recommendations for nutritional supplements for dry eye disease: current advances.Frontiers in pharmacology · 2024Review
- Prevalence and associated risk factors of dry eye disease in Hotan, Xinjiang: a cross-sectional study.BMC ophthalmology · 2023Article
- Antioxidant Nutraceutical Strategies in the Prevention of Oxidative Stress Related Eye Diseases.Nutrients · 2023Review
- The relationship between habitual water intake and dry eye disease.Acta ophthalmologica · 2023Article
- Effect of surgical face mask wearing on tear film in women with a high body mass index.PloS one · 2022Article
- Improvement in Tear Ferning Patterns of Sheep Tears After Addition of Various Electrolyte Solutions.Frontiers in medicine · 2021Article
- Analysis of Tear Ferning Patterns in Young Female Subjects with Refractive Errors.Journal of ophthalmology · 2021Article
- Review
- The Case for a More Holistic Approach to Dry Eye Disease: Is It Time to Move beyond Antibiotics?Antibiotics (Basel, Switzerland) · 2019Review
- Assessment of tear film in subjects with a high body mass index.Clinical optometry · 2019Article
- Effect of Refresh PlusClinical ophthalmology (Auckland, N.Z.) · 2019Article
- A comparative study of the quality of non-stimulated and stimulated tears in normal eye male subjects using the tear ferning test.Clinical optometry · 2019Article
- Assessment of the tear film in normal eye subjects after consumption of a single dose of hot peppermint drink.Clinical optometry · 2019Article
Corrections and comments
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Authors and funding
6 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveThe study aimed to investigate the acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects.
methodsForty normal eye subjects (22 men and 18 women) aged 19-39 years were enrolled in the study. Also, an age matching control group (20 males and 20 females) was enrolled for comparison. McMonnies dry eye symptoms questionnaire and slit lamp were used for the exclusion criteria determination. Phenol red thread (PRT) test was performed on both eyes of each subject. A tear sample was collected from the lower tear meniscus of the right eye of each subject for the tear ferning (TF) test, which was performed before (30 minutes) and after (60 minutes) drinking green tea.
resultsThe median PRT measurement after green tea consumption was lower (median [IQR]=23.50 [8.00] mm) compared to that before consumption (median [IQR]=27.00 [8.75] mm). In contrast, the median TF grade was significantly higher following green tea consumption than that before consumption (median [IQR]=2.65 [1.23] vs 1.50 [0.88] mm, respectively). The results show that TF grades increased in 97.5%, and the red phenol thread scores decreased in 80% of the subjects after green tea consumption compared to those before consumption. The PRT readings and TF grades were significantly different (
conclusionDrinking green tea could have a significant effect on the eye tear film quality. Tear quality appeared to decrease after green tea consumption.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.