Effect of Fasting on Choroidal Thickness and Its Diurnal Variation

Uyar, Enes; Doğan, Ümit; Ulaş, Fatih; Çelebi, Serdal

doi:10.1080/02713683.2019.1584677

Cited by 16 publications

(6 citation statements)

References 23 publications

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“…They included 30 eyes of 30 POAG fasting patients, 40 healthy participants, and 40 nonfasting healthy individuals. 78 POAG patients had a higher IOP at 4 pm during the fasting period than was seen following Ramadan. In addition, the diurnal reduction in IOP and central corneal thickness was more minor in patients with POAG compared with healthy subjects.…”

Section: Highlights Of the Year's Literaturementioning

confidence: 80%

“…Three articles were published on eye structure and function during RF. 78 79 80 First, the effect of RF and dehydration on intraocular pressure (IOP) and biometric parameters in primary open-angle glaucoma (POAG) patients was evaluated in a prospective study. They included 30 eyes of 30 POAG fasting patients, 40 healthy participants, and 40 nonfasting healthy individuals.…”

Section: Highlights Of the Year's Literaturementioning

confidence: 99%

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Ramadan Fasting in Health and Disease in 2021: A Narrative Review

Hassan-Beck

Hafidh

Badi³

et al. 2022

Ibnosina Journal of Medicine and Biomedical Sciences

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Introduction: The literature on the health aspects of Ramadan fasting (RF) is widely spread in many journals. Materials and Methods: This is a narrative review of data obtained from the PubMed database (National Library of Medicine, Bethesda, Maryland, United States). We used the search term “Ramadan fasting,” and relevant records were examined. The publications are narrated thematically. Results: The publications spanned fundamental, clinical, professional, cultural, and advocacy facets. The publications crossed conventional disciplinary lines and geographical locations and appeared in journals with different access systems. The contents are presented under the themes that emerged depending on the retrieved literature. This year basic coverage included changes in physiology and nutrition during Ramadan. However, the clinical issues included a wide range of topics. These included the impact of RF on nonalcoholic fatty liver disease and adjustments needed in endocrine replacement therapy for hypothyroidism and adrenal insufficiency. Coverage also included chronic kidney disease. The impact on maternal health, fetal well-being, and long-term effects of RF exposures were addressed in several studies. Studies in cardiovascular medicine focused on blood pressure and cardiovascular risk factors. Sports medicine and athletes' well-being received somewhat prominent coverage. The impact on renal function, particularly in patients with chronic kidney disease, was investigated by a few authors. Several groups addressed the eyes' structure and function, neurological conditions, especially headache disorders, and hematological and oncological conditions. Finally, the impact of RF on several aspects of mental health and well-being was addressed by various groups. Conclusions: Health aspects of RF received a sustained academic interest with a broad spectrum in 2021. This narration provides an overview of the year's scholarly health-related literature on various aspects of health and disease. It should help researchers and clinicians catch up quickly with the health concerns during Ramadan.

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Section: Highlights Of the Year's Literaturementioning

confidence: 80%

Section: Highlights Of the Year's Literaturementioning

confidence: 99%

Ramadan Fasting in Health and Disease in 2021: A Narrative Review

Hassan-Beck

Hafidh

Badi³

et al. 2022

Ibnosina Journal of Medicine and Biomedical Sciences

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“…Moreover, previous work employing SD-OCT in the field of veterinary ophthalmology for retinal imaging was referred to [ 38 , 39 , 40 , 41 , 42 , 43 ]. We determined the outer border of the choroid (i.e., the inner surface of the sclera) based on the veterinary ophthalmology literature describing the histological structure of the dog choroid [ 44 ] and human ophthalmology literature describing the method of measuring the thickness of choroid [ 45 , 46 , 47 , 48 , 49 , 50 , 51 ].…”

Section: Discussionmentioning

confidence: 99%

Morphological and Morphometric Analysis of Canine Choroidal Layers Using Spectral Domain Optical Coherence Tomography

Zwolska

Balicki

Balicka

2023

IJERPH

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The choroid, a multifunctional tissue, has been the focus of research interest for many scientists. Its morphology and morphometry facilitate an understanding of pathological processes within both the choroid and retina. This study aimed to determine the choroidal layer thicknesses in healthy, mixed-breed mesocephalic dogs, both male (M) and female (F), using spectral domain optical coherence tomography (SD-OCT) with radial, cross-sectional, and linear scans. The dogs were divided into two groups based on age: middle-aged (MA) and senior (SN). Thicknesses of choroidal layers, namely RPE–Bruch’s membrane–choriocapillaris complex (RPE-BmCc) with tapetum lucidum in the tapetal fundus, the medium-sized vessel layer (MSVL), and the large vessel layer with lamina suprachoroidea (LVLS), as well as whole choroidal thickness (WCT), were measured manually using the caliper function integrated into the OCT software. Measurement was performed dorsally and ventrally at a distance of 5000–6000 μm temporally and nasally at a distance of 4000–7000 μm to the optic disc on enhanced depth scans. The measurements were conducted temporally and nasally in both the tapetal (temporal tapetal: TempT, nasal tapetal: NasT) and nontapetal (temporal nontapetal: TempNT, nasal nontapetal: NasNT) fundus. The ratio of the MSVL thickness to the LVLS thickness for each region was calculated. In all examined dogs, the RPE-BmCc in the dorsal (D) region and MSVL in the Tt region were significantly thicker than those in the other regions. The MSVL was thinner in the ventral (V) region than in the D, TempT, TempNT and NasT regions. The MSVL was significantly thinner in the NasNT region than in the D region. LVLS thickness and WCT were significantly greater in the D and TempT regions than those in the other regions and significantly lesser in the V region than those in the other regions. The MSVL-to-LVLS thickness ratio did not differ between the age groups. Our results reveal that the choroidal thickness profile does not depend on age. Our findings can be used to document the emergence and development of various choroidal diseases in dogs in the future.

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“…Among the effects of fasting are changes to the eyes and eye functions (3). It can influence ocular blood flow, intraocular pressure (IOP), and anterior and posterior segment parameters (4)(5)(6)(7)(8). Studies that have focused on the effects of fasting on IOP values have suggested that higher sympathetic nervous system activity as well as elevated levels of free fatty acids, cortisol, and norepinephrine may lead to an increased IOP during fasting (3,(9)(10)(11)(12).…”

Section: Introductionmentioning

confidence: 99%

Evaluation Of The Effect Of Fasting In Glaucoma Patients

Uyar¹

2021

Beyoglu Eye J

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The aim of this research was to evaluate the effect of daytime Ramadan fasting and dehydration on intraocular pressure (IOP) and biometric parameters in primary open-angle glaucoma (POAG) patients. Methods: This prospective study included 30 eyes of 30 POAG patients who were fasting during Ramadan (Group 1), 40 healthy participants who were fasting (Group 2), and 40 healthy individuals who were not fasting (Group 3). The eyes were evaluated twice a day at approximately 8 am and 4 pm during Ramadan and 1 month after Ramadan. Results: IOP values at 4 pm were higher in Group 1 than Groups 2 and 3 in Ramadan (p=0.029 and 0.007, respectively). The diurnal reduction in IOP was significantly smaller during fasting in the glaucoma patients compared with Groups 2 and 3 (p=0.012 and 0.007, respectively). Comparisons of biometric parameters revealed less reduction in central corneal thickness (CCT) values from 8 am to 4 pm in glaucoma patients than in Groups 2 and 3 (p<0.05 for all comparisons) during Ramadan and after Ramadan. Conclusion: POAG patients had a higher IOP at 4 pm during the fasting period than was seen following Ramadan. In addition, the diurnal reduction of IOP and CCT was smaller in patients with POAG compared with healthy subjects.

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Effect of Fasting on Choroidal Thickness and Its Diurnal Variation

Cited by 16 publications

References 23 publications

Ramadan Fasting in Health and Disease in 2021: A Narrative Review

Ramadan Fasting in Health and Disease in 2021: A Narrative Review

Morphological and Morphometric Analysis of Canine Choroidal Layers Using Spectral Domain Optical Coherence Tomography

Evaluation Of The Effect Of Fasting In Glaucoma Patients

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