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EFFECT OF FASTING ON CHOROIDAL THICKNESS AND ITS DIURNAL VARIATION.

Current Eye Research 2019 Februrary 20
PURPOSE: The aim of this study was to assess the effect of the Ramadan fasting on choroidal thickness and its associated diurnal variations using spectral domain-optic coherence tomography.

MATERIALS AND METHODS: Ocular measurements were performed on a single eye of 87 healthy individuals. Eyes were evaluated twice a day around 8.00 a.m. and 4.00 p.m. during Ramadan. Evaluations were repeated at the same time of the day one month following the Ramadan on the same subjects. Measurements of choroidal and retinal thickness were performed at central, temporal and nasal segments.

RESULTS: The comparison of measurements revealed that temporal choroidal thickness at 8.00 a.m. and foveal, temporal and nasal choroidal thicknesses at 4.00 p.m. were significantly reduced during fasting (p values were 0.005, < 0.001, 0.001 and 0.046, respectively). Mean changes of choroidal thicknesses during fasting were 14.76 ± 16.01, 9.90 ± 19.57 and 8.10 ± 16.81 µm at fovea, temporal and nasal segment, respectively. However, choroidal thicknesses at non-fasting conditions were measured as 6.13 ± 12.93, 3.78 ± 15.23 and 5.05 ± 13.60 µm, respectively. In comparison, diurnal variations of foveal and temporal choroidal thicknesses during fasting were significantly higher than the controls (p values were < 0.001 and 0.004, respectively). Additionally, retinal thicknesses during fasting was significantly reduced compared to the controls in all segments measured at 4.00 p.m. (p for all values < 0.05) Conclusions: The results of the present study revealed that fasting and dehydration caused a reduction of the choroidal and retinal thicknesses. Likewise, they are also responsible for increased diurnal variation of choroidal thicknesses. Therefore, early hours of the day may be preferred to evaluate retinal and choroidal thicknesses during Ramadan to avoid the effects of dehydration on the measurement results.

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