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Quantification of trabecular-iris contact and its prevalence by optical coherence tomography in a healthy Caucasian population

Abstract

Purpose

To determine the prevalence of trabecular-iris contact (TIC) and quantify this contact in healthy Caucasian individuals using Fourier-domain optical coherence tomography (FD-OCT).

Methods

For this cross-sectional study, 2,012 eyes of 1,006 healthy subjects were recruited among individuals undergoing a routine ophthalmologic checkup. In each participant, age, sex, intraocular pressure, and spherical refractive error were first recorded along with anterior chamber depth and volume, central corneal thickness measured with the Pentacam, and axial length with the IOLMaster. Anterior chamber angle variables and the presence of TIC in the horizontal quadrants were determined by anterior segment FD-OCT (RTVue 100®). When TIC was observed, TIC length (TICL) and its percentage in relation to the length of the trabecular meshwork (TICL percentage) were also measured.

Results

Trabecular-iris contact in the horizontal quadrants was observed in 34 eyes of 25 patients, representing 1.6% of the total number of eyes examined. In this subgroup of individuals, mean age was 55.8 years, 84% were women, and spherical refractive error ranged from -0.25 to 8.25 D. Eyes with TIC showed an angle width of less than 23.2 degrees and axial length shorter than 23.7 mm. Mean TICL was 239 ± 79 μm (103-495 μm) and mean TICL percentage was 46.9% ± 13.9% (17.2%-76.3%).

Conclusions

The prevalence of TIC was low in this population. Fourier-domain optical coherence tomography emerged as useful to assess its prevalence and quantify the extent of TIC.

Eur J Ophthalmol 2017; 27(4): 417 - 422

Article Type: ORIGINAL RESEARCH ARTICLE

DOI:10.5301/ejo.5000919

Authors

José Ignacio Fernández-Vigo, Lucía De-Pablo-Gómez-De-Liaño, Cristina Fernández-Vigo, Inés Sánchez-Guillén, Enrique Santos-Bueso, José María Martínez-de-la-Casa, Julián García-Feijóo, José Ángel Fernández-Vigo

Article History

Disclosures

Financial support: No financial support was received for this submission.
Conflict of interest: None of the authors has conflict of interest with this submission.

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Authors

Affiliations

  • Department of Ophthalmology, Hospital Universitario Clínico San Carlos, Instituto de Investigación Sanitaria San Carlos (IdISSC), Madrid - Spain
  • Centro Internacional de Oftalmología Avanzada, Madrid - Spain
  • Department of Ophthalmology, Universidad de Extremadura, Badajoz - Spain

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