Evidence map›Paper›PMID 21045650›Full record

ArticleCornea2011

Tear film volume and protein analysis in full-term newborn infants.

M Esmaeelpour, P O Watts, M E Boulton, J Cai, P J Murphy

Abstract readComparative Study
In one paragraph

Article in Cornea, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
11citing papers in PubMed, 1 pooled it
0.3field-weighted citation impact, top 32% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

11 citing papers in PubMed, 1 synthesis or guideline pooled it, 24 citations in OpenAlex.

  1. Lactoferrin Concentration in Human Tears and Ocular Diseases: A Meta-Analysis.Investigative ophthalmology & visual science · 2020
    Pooled it
  2. Optimizing instilled drug delivery: a scoping review of microdrops in ophthalmology.Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie · 2025
    Article
  3. NanoLC-timsTOF-Assisted Analysis of Glycated Albumin in Diabetes-Affected Plasma and Tears.Journal of the American Society for Mass Spectrometry · 2024
    Article
  4. Review
  5. Ophthalmia neonatorum as the presenting sign of SARS-CoV-2.Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus · 2021
    Article
  6. Review
  7. Review
  8. Article
  9. Effects of Lipid Saturation on the Surface Properties of Human Meibum Films.International journal of molecular sciences · 2018
    Article
  10. Tear protein analysis in presumed congenital alacrima.Clinical ophthalmology (Auckland, N.Z.) · 2018
    Article
  11. Formulations for children: problems and solutions.British journal of clinical pharmacology · 2015
    Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 4 institutions in 2 countries.

M EsmaeelpourSchool of Optometry and Vision Sciences, Cardiff University, UK. esmaeelpourm@cf.ac.uk
P O Watts
M E Boulton
J Cai
P J Murphy
Cardiff University · GBOphthalmology Associates (United States) · USUniversity Hospital of Wales · GBUniversity of Florida · US

Funding

Vision Research CoreP30EY021721 · NEI · UNIVERSITY OF FLORIDA · PI HAUSWIRTH, WILLIAM W · 2011 to 2015
$2.8M
NEI NIH HHS P30 EY021721
6 · The paper itself

Abstract

purposeTo investigate infant tear film secretion and protein profile, and to compare major tear proteins, such as immunoglobulin A, lactoferrin, and lysozyme, with those of adult controls.

methodsTears were collected, with a cellulose rod, from 40 healthy infants (19 female infants and 21 male infants, gestational duration: 39.71 ± 1.27 weeks) within 48 hours of birth and 22 adults (10 female infants and 12 male infants, mean age: 24.95 ± 3.63 years). A second collection was obtained from 14 of the infants (8 female infants and 6 male infants, postnatal age: 7.76 ± 6.14 weeks). The tear volume was measured, and protein in the samples was analyzed by Bradford assay and gel electrophoresis.

resultsMedian tear volume (interquartile range) was 0.5 μL (0.6-2 μL) for newborn infants, 2.5 μL (1.4-7.75 μL) for these infants at an older age, and 6 μL (2.73-12.75 μL) in adults (P < 0.001, Kruskall-Wallis test). Immunoglobulin A concentration was significantly lower in newborns (P < 0.001, analysis of variance). Lipocalin was present in 36% of the newborn tear samples, whereas serum albumin was found in 86%. Mean protein concentration (μg/μL ± SD) was 10.95 ± 5.51 in the newborns, 12.93 ± 3.99 in the older infants, and 13.04 ± 3.46 in the adults (P > 0.5, analysis of variance).

conclusionsThis is the first study reporting an investigation of unstimulated infant tears, using a noninvasive collection method. Tear protein content demonstrated that the infant tear film is different to that in adults.

Indexed as

Term BirthElectrophoresis, Polyacrylamide GelEye ProteinsFemaleGestational AgeHumansImmunoglobulin A, SecretoryInfant, NewbornLactoferrinMaleMuramidaseTearsYoung AdultEye ProteinsImmunoglobulin A, SecretoryLactoferrinLTF protein, humanMuramidasetear proteins

Identifiers

PMID21045650
PMCPMC3650608
OpenAlexW1973823613

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.