The acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects
Ali M Masmali, Saud A Alanazi, Abdullah G Alotaibi, Raied Fagehi, Ali Abusharaha, Gamal A El-Hiti Cornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh 11433, Saudi Arabia Objective: The study aimed to investigate the acute effect of a si...
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Dove Medical Press
2019
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oai:doaj.org-article:cfc7b40818f34867b11825ab34be37ac2021-12-02T06:31:18ZThe acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects1177-5483https://doaj.org/article/cfc7b40818f34867b11825ab34be37ac2019-04-01T00:00:00Zhttps://www.dovepress.com/the-acute-effect-of-a-single-dose-of-green-tea-on-the-quality-and-quan-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Ali M Masmali, Saud A Alanazi, Abdullah G Alotaibi, Raied Fagehi, Ali Abusharaha, Gamal A El-Hiti Cornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh 11433, Saudi Arabia Objective: The 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. Methods: Forty 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. Results: The 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 (P<0.05) before and after green tea consumption. Conclusion: Drinking green tea could have a significant effect on the eye tear film quality. Tear quality appeared to decrease after green tea consumption. Keywords: dry eye, tear ferning test, green tea, phenol red thread test, tear film, polyphenolsMasmali AMAlanazi SAAlotaibi AGFagehi RAbusharaha AEl-Hiti GADove Medical Pressarticledry eyetear ferning testgreen teaphenol red thread testtear filmpolyphenolsOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 13, Pp 605-610 (2019) |
| institution |
DOAJ |
| collection |
DOAJ |
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EN |
| topic |
dry eye tear ferning test green tea phenol red thread test tear film polyphenols Ophthalmology RE1-994 |
| spellingShingle |
dry eye tear ferning test green tea phenol red thread test tear film polyphenols Ophthalmology RE1-994 Masmali AM Alanazi SA Alotaibi AG Fagehi R Abusharaha A El-Hiti GA The acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects |
| description |
Ali M Masmali, Saud A Alanazi, Abdullah G Alotaibi, Raied Fagehi, Ali Abusharaha, Gamal A El-Hiti Cornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh 11433, Saudi Arabia Objective: The 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. Methods: Forty 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. Results: The 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 (P<0.05) before and after green tea consumption. Conclusion: Drinking green tea could have a significant effect on the eye tear film quality. Tear quality appeared to decrease after green tea consumption. Keywords: dry eye, tear ferning test, green tea, phenol red thread test, tear film, polyphenols |
| format |
article |
| author |
Masmali AM Alanazi SA Alotaibi AG Fagehi R Abusharaha A El-Hiti GA |
| author_facet |
Masmali AM Alanazi SA Alotaibi AG Fagehi R Abusharaha A El-Hiti GA |
| author_sort |
Masmali AM |
| title |
The acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects |
| title_short |
The acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects |
| title_full |
The acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects |
| title_fullStr |
The acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects |
| title_full_unstemmed |
The acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects |
| title_sort |
acute effect of a single dose of green tea on the quality and quantity of tears in normal eye subjects |
| publisher |
Dove Medical Press |
| publishDate |
2019 |
| url |
https://doaj.org/article/cfc7b40818f34867b11825ab34be37ac |
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