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Consistency of corneal sublayer thickness measurements using Fourier-domain optical coherence tomography after phacoemulsification

Abstract

Purpose

To assess the reliability of corneal epithelial thickness (CET), nonepithelial central corneal thickness (NECCT), and central corneal thickness (CCT) measurements using Cirrus high-definition optical coherence tomography (HD-OCT) in patients who did and did not undergo cataract surgery.

Methods

Forty patients who underwent uneventful phacoemulsification and 40 healthy participants were recruited to evaluate the intraobserver repeatability and interobserver reproducibility of CET, NECCT, and CCT measurements using Cirrus HD-OCT. To analyze repeatability, one examiner obtained 5 consecutive scans in each participant; for interobserver reproducibility, another examiner randomly obtained another scan. Within-subject standard deviation, coefficient of variation (CV), limits of agreement, and intraclass correlation coefficient (ICC) data were obtained.

Results

For intraobserver repeatability, the intrasession CV (CVw) and ICC values of the CET in the operated and nonoperated groups were 3.7% and 0.80 and 3.8% and 0.73, respectively; for NECCT, 0.7% and 0.98 and 0.8% and 0.97; and for CCT, 0.6% and 0.99 and 0.7% and 0.98. For interobserver reproducibility, the CVw and ICC values for the CET in the operated and nonoperated groups were 2.6% and 0.82 and 2.3% and 0.62, respectively; for NECCT, 0.7% and 0.98 and 0.5% and 0.98; and for CCT, 0.5% and 0.99 and 0.4% and 0.99.

Conclusions

The corneal sublayer thickness can be measured reliably using Cirrus HD-OCT in patients who underwent cataract surgery and elderly participants; however, the CET consistency is poorer than the NECCT. Corneal epithelial thickness modifications exceeding 4% reflect true thickness changes instead of random error variations using HD-OCT.

Eur J Ophthalmol 2016; 26(6): 540 - 545

Article Type: ORIGINAL RESEARCH ARTICLE

DOI:10.5301/ejo.5000776

Authors

Alberto López-Miguel, María Calabuig-Goena, Victoria Marqués-Fernández, Itziar Fernández, Jorge L. Alió, Miguel J. Maldonado

Article History

Disclosures

Financial support: Supported in part by the Spanish Ministerio de Economía y Competitividad through Research Projects RETICS RD12/0034/0001 (Oftalmología) and SAF2012-40227-C02-01. No funding organizations had a role in the design or conduct of this research.
Conflict of interest: None of the authors has conflict of interest with this submission.

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Authors

Affiliations

  •  IOBA, Universidad de Valladolid, Valladolid - Spain
  •  Hospital Universitario Rio Hortega, Valladolid - Spain
  •  Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Valladolid - Spain
  •  Vissum Instituto Oftalmologico de Alicante, Alicante - Spain

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