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Graefes Arch Clin Exp Ophthalmol. 2019 Mar;257(3):645-650. doi: 10.1007/s00417-019-04240-2. Epub 2019 Jan 19.

Infrared photographs with a selective wavelength filter to diagnose small-angle esotropia in young children.

Author information

1
Department of Ophthalmology, Kangwon National University Hospital, Kangwon National University Graduate School of Medicine, Chuncheon, South Korea.
2
Department of Ophthalmology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea.
3
Department of Electrical and Computer Engineering, Seoul National University, Seoul, South Korea.
4
Department of Biomedical Engineering, College of Medicine, Gachon University, Inchon, South Korea.
5
Department of Ophthalmology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea. hjm@snu.ac.kr.

Abstract

PURPOSE:

To validate the effectiveness of the selective wavelength filter analysis with infrared photographs for diagnosing small-angle esotropia in children under age 4.

METHODS:

This is a retrospective, observational, case-control study. A total of 83 esotropes with an esodeviation of ≤ 16 prism diopters (PD) and 75 orthotropic controls under 4 years of age were included. Full-face infrared photographs were taken with a selective wavelength filter in front of either eye. The angles of esodeviation on photographs were measured with the three-dimensional Strabismus Photo Analyzer. The alternate prism and cover test or the Krimsky test were repeatedly performed to measure ocular alignment.

RESULTS:

The testability of infrared photographs using selective wavelength filters in children under 4 years of age was 85.6%. The mean angle of esodeviation was 11.3 ± 4.0 PD by manual measurements and 11.5 ± 4.4 PD by the infrared photograph analysis. Manual measurements and the infrared photograph analysis showed a strong positive correlation (R = 0.815, P < 0.001). The sensitivity and specificity of the infrared photograph analysis for detecting small-angle esotropia were 95.2% and 77.9%, respectively, with a cutoff value of 4.0 PD.

CONCLUSIONS:

The automated infrared photograph analysis was simple and effective for diagnosing small-angle esotropia in young children.

KEYWORDS:

Alignment; Esotropia; Image analysis; Selective wavelength filter

PMID:
30661115
DOI:
10.1007/s00417-019-04240-2
[Indexed for MEDLINE]

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