Visualization of the precorneal tear film using ultrahigh resolution optical coherence tomography in dry eye

Lele Cui, Jianhua Wang, Victor L. Perez, Meixiao Shen, Yimin Yuan, Michael R. Wang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

PURPOSE:: To visualize the precorneal tear film (PCTF) in dry eye patients using ultrahigh resolution optical coherence tomography (UHR-OCT). METHODS:: A custom-built UHR-OCT with ultrahigh resolution (∼3 μm) was used to image the PCTF at the vertical meridian. Eighteen right eyes of 18 previously diagnosed dry eye patients (9 men and 9 women, age, 47.8±20.7 years) with aqueous tear deficiency were studied. Images were taken during normal and delayed blinking. The visualized PCTF was measured directly. An indirect calculation was used to obtain the thickness in cases where the PCTF could not be visualized. RESULTS:: During normal blinking, the PCTF was visualized in 5 of 18 eyes (27.8%) with an average PCTF thickness of 5.8 μm (SD, 1.3 μm). During delayed blinking, the PCTF was visualized in 11 eyes (61.1%) with a significantly increased average thickness of 7.3 μm (SD, 0.9 μm; P<0.05). The percent increase of the visualized PCTF thickness was higher during delayed blinking compared with normal blinking (χ test, P<0.05). The averaged PCTF was 4.4 μm during normal blinking, and the PCTF thickness was significantly increased to 6.6 μm (SD, 2.9 μm; P<0.05) during delayed blinking. CONCLUSIONS:: We report the first visualization of PCTF in vivo in dry eye patients with UHR-OCT. Precorneal tear film can be directly visualized in some eyes during both normal and delayed blinking, and it seemed thicker during delayed blinking compared with normal blinking.

Original languageEnglish (US)
Pages (from-to)240-244
Number of pages5
JournalEye and Contact Lens
Volume38
Issue number4
DOIs
StatePublished - Jul 2012

Keywords

  • Dry eye
  • Optical coherence tomography
  • Tear film

ASJC Scopus subject areas

  • Ophthalmology

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