Polarimetric interferometry for assessment of corneal stromal lamellae orientation

Alfonso Iovieno, Sonia N. Yeung, Yoav Nahum, Joshua C. Teichman, Eugenio Lipari, Massimo Busin, Luigi Fontana

Research output: Contribution to journalArticle

Abstract

Purpose: To analyze corneal stromal lamellae orientation in normal subjects and patients with various corneal conditions using a polarimetric interferometer. Methods: Thirty-two healthy control subjects (59 eyes) and 16 patients (22 eyes) with corneal conditions or postkeratoplasty were included in the study. All patients were imaged using the interferometer and slit lamp photography. The interferometer produces an orthogonal cross-like image of stromal lamellae by illuminating the cornea in phaselight polarization angle. Corneal haze was graded on a scale from 0 to 4. Interferometer cross-like images were graded on a scale from 0 to 5 by a masked observer. Keratometry, corneal central pachymetry, and optical densitometry were obtained with Scheimpflug corneal tomography. Results: The cross-like image was observed in 31 of 32 healthy control subjects (58 of 59 eyes) and in 13 of 16 patients (19 of 22 eyes). The image was not detectable in 3 patients, 1 with total corneal neovascularization and scarring, 1 with central leukoma, and 1 with failed deep lamellar keratoplasty. Corneal haze was the main factor obscuring the cross-like image (P < 0.05). Clarity of the images was influenced by older age, steeper keratometry, higher pachymetry, and optical density (P < 0.05). There was no correlation between the orientation of the keratometric axes and the orientation of the 2 arms of the cross-like image (P > 0.05). Conclusions: Corneal stromal lamellae orientation can be efficiently assessed and displayed as a cross-like image by the polarimetric interferometer. Stromal lamellae orientation imaging may have potential implications in corneal diagnostics and surgery.

Original languageEnglish
Pages (from-to)519-522
Number of pages4
JournalCornea
Volume35
Issue number4
DOIs
Publication statusPublished - Mar 4 2016
Externally publishedYes

Keywords

  • Corneal stroma
  • Interferometry
  • Orientation
  • Polarimetry

ASJC Scopus subject areas

  • Ophthalmology

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    Iovieno, A., Yeung, S. N., Nahum, Y., Teichman, J. C., Lipari, E., Busin, M., & Fontana, L. (2016). Polarimetric interferometry for assessment of corneal stromal lamellae orientation. Cornea, 35(4), 519-522. https://doi.org/10.1097/ICO.0000000000000776