Tears often have 25 % higher levels of vitamin D than does blood

Correlation between tear fluid and serum vitamin D levels - Sept 2016

Eye Vis (Lond). 2016 Sep 2;3(1):22. doi: 10.1186/s40662-016-0053-7. eCollection 2016.
Sethu S1, Shetty R2, Deshpande K2, Pahuja N2, Chinnappaiah N2, Agarwal A2, Sharma A1, Ghosh A1.
1 GROW Research Laboratory, Narayana Nethralaya Foundation, #258/A Hosur Road, Narayana Health City, Bommasandra, 560099 Bangalore, India.
2 Cornea and Refractive Surgery Division, Narayana Nethralaya, Bangalore, India.

Vitamin D levels in nanograms/mL
Tear (vertical) is often 10 ng higher than in Blood (horizontal)

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BACKGROUND:
Vitamin D deficiency is associated with a range of systemic diseases including ocular disorders. The objective of this study is to measure tear vitamin D levels and investigate the correlation between serum and tear vitamin D levels.
METHODS:
A total of 48 healthy volunteers without any systemic and ocular disease were recruited for this observational cohort study. Serum was collected using clot activator coated Vacutainer® Plus tubes. Tear fluid was collected using Schirmer's strips. Serum and tear total 25-hydroxyvitamin D levels were measured by competitive chemiluminescent ELISA and the correlation between the levels were studied.
RESULTS:
The measured serum 25-hydroxyvitamin D level ranged between 3.3 and 27.5 ng/ml (Mean ± SEM, 9.4 ± 0.7 ng/ml; Median 8.4 ng/ml). Significantly (p < 0.0001) higher level of 25-hydroxyvitamin D was detected in the tears (Mean ± SEM, 17.0 ± 1.6 ng/ml; Range 3.2-45.8 ng/ml; Median, 16.3 ng/ml) compared to serum. An average of ~2 fold (Mean ± SEM, 1.9 ± 0.2; Range 0.4-5.8; Median, 1.7) higher 25-hydroxyvitamin D was observed in tears compared to serum in the subjects. In addition, a positive correlation was observed between serum and tear 25-hydroxyvitamin D levels (r = 0.5595; p < 0.0001).
CONCLUSIONS:
A higher level of 25-hydroxyvitamin D was observed in the tear fluid compared to that of the serum. It would be beneficial to consider tear vitamin D levels to study its role with reference to ocular surface diseases.

PMID: 27595117 PMCID: PMC5009644 DOI: 10.1186/s40662-016-0053-7

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Vitamin D level in tears 38 ng, blood 30 ng - Jan 2019

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Vitamin D level in tears 38 ng, blood 30 ng (no vision problems) – Nov 2017

74 – Determination of Vitamin D in Tears of Healthy Individuals by the Electrochemiluminescent Method
Free Radical Biology and Medicine, Vol 112, Supplement 1, November 2017, Pages 62–63, https://doi.org/10.1016/j.freeradbiomed.2017.10.087
Renato Leca, Lai Yu Tsun, Fernando Fonseca

Introduction: Vitamin D is a fat-soluble steroid hormone, which can be converted into various forms, which are extremely physiologically important for our body. However it has not yet been well studied its functions and local metabolic pathways in some organs, such as eye.

Purpose: To verify the correlation between vitamin D levels in blood and tear and the possibility of using tear as a biological material for monitoring eye disorders in the future.

Methods: An electrochemiluminescence method was used to examine the blood and tear samples, which was collected with a Schirmer test strip from 21 individuals without ocular disease.

Results: At the 95% confidence interval, tear vitamin’s mean = 37.8 ± 3.6ng / mL, which is higher than the serum level, which presents a mean of 30.3 ± 7.7ng / mL; The coefficient of correlation of Lin = –0.018 (–0.174; 0.139), Pearson coefficient = –0.070 and the Bland-Altman coefficient = –11.12 (–30.40; 8.16). Results obtained by the program Stata version 11.0.

Conclusions: It is possible to determine levels of vitamin D in the tear using the electrochemiluminescence method and as the results with the blood do not correlate, there is possibility of using the tear as a biological matrix for detection

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Wonder if tear vitamin D is lower in those with some vision problems?

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