Eye disorders 1.86 X more likely if low vitamin D – Oct 2024

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Vitamin D levels and risk of ocular disorders: insights from bidirectional and multivariable Mendelian randomization analysis

Front. Med. doi: 10.3389/fmed.2024.1431170
Shipei Fan1f, Xing-yu Shi2t, Xia Li1, Jun Li1* and Song-ping Yu1*
department of Ophthalmology, Lishui Municipal Central Hospital, The Fifth Affiliated Hospital of Wenzhou Medical University, Zhejiang, China, department of Nephrology, Lishui Municipal Central Hospital, The Fifth Affiliated Hospital of Wenzhou Medical University, Zhejiang, China

Purpose: This study aimed to assess the causal relationships between vitamin D levels and ocular disorders.

Methods: Independent genetic variables were obtained from genome-wide association studies (GWAS) and publicly available databases. The summary statistics for 25-hydroxyvitamin D (25(OH)D) were obtained from two large-scale GWAS studies, with sample sizes of 324,105 and 417,580 European individuals. The genetic variants of myopia, primary open angle glaucoma (POAG), anterior iridocyclitis, senile cataract, diabetic retinopathy (DR), retinal vein occlusion (RVO), wet age-related macular degeneration (WAMD) and optic neuritis were extracted from the latest release of FinnGen consortium, which contains genome data from Finnish participants. Subsequently, Mendelian randomization (MR) analyses were conducted to obtain effect estimates. Additionally, we performed multivariable MR analysis and mediation analysis to validate the results.

Results: In the discovery dataset, genetically predicted vitamin D concentration was found to be causally associated with an increased risk of WAMD, (odd ratio (OR) = 1.35, 95% confidence interval (CI) = 1.09-1.67, PIVW =0.005). However, no causal effects of genetically predisposed vitamin D levels on the risk of most types of ocular disorders were observed. Reverse MR revealed no causal relationships between the ocular diseases and vitamin D concentrations.
The MR analyses of the validation dataset yielded consistent results. Additionally, the causal effect of vitamin D levels on the risk of WAMD remained significant after adjusting for potential confounders in the multivariable MR analysis (OR = 1.86, 95% CI = 1.26-2.73, PIVW = 0.002).

Conclusion: Our MR analysis results provide robust evidence of a causal relationship between genetically predicted 25(OH)D levels and an increased risk of WAMD in European population. These findings offer important insights into the management and control of ocular disorders.
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VitaminDWiki – Vision category contains:

• 12% larger pupils in children who are Vitamin D deficient – Feb 2024 parasympathetic nervous system?
• Myopia, AMD, Dry Eye, and Diabetic Retinopathy are all associated with low Vitamin D - April 2023
• An ocular disease can be associated with low vitamin D and 1 of 5 poor vitamin D genes – June 2022
• Eye vitamin D may not be associated with blood VitD, but is associated with CYP27B1 and CYP24A1 – Nov 2019
• Vitamin D treats and prevents a variety of eye problems (need 70 ng) – June 2018
• Vitamin D and Myopia, AMD, Diabetic Retinopathy, Uveitis, Glaucoma, VDR etc. – May 2015
• Tears often have 25 % higher levels of vitamin D than does blood

Vision problems having many studies on VitaminDWiki

• Uveitis (inflamed eye) and Vitamin D - many studies
• Age-Related Macular Degeneration and Vitamin D - many studies
• Cataracts and Vitamin D - many studies
• Diabetic Retinopathy associated with low Vitamin D - many studies
• 7+ studies of Glaucoma and Vitamin D
• Dry Eyes treated by Omega-3 and Vitamin D – many studies
• 21+ studies of Myopia and Vitamin D

112 items in Vision category