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Journal of Imaging Informatics in Medicine

Published in:

01-08-2015

Computer-Aided Methodology for Syndromic Strabismus Diagnosis

Authors: João Dallyson Sousa de Almeida, Aristófanes Corrêa Silva, Jorge Antonio Meireles Teixeira, Anselmo Cardoso Paiva, Marcelo Gattass

Published in: Journal of Imaging Informatics in Medicine | Issue 4/2015

Abstract

Strabismus is a pathology that affects approximately 4 % of the population, causing aesthetic problems reversible at any age and irreversible sensory alterations that modify the vision mechanism. The Hirschberg test is one type of examination for detecting this pathology. Computer-aided detection/diagnosis is being used with relative success to aid health professionals. Nevertheless, the routine use of high-tech devices for aiding ophthalmological diagnosis and therapy is not a reality within the subspecialty of strabismus. Thus, this work presents a methodology to aid in diagnosis of syndromic strabismus through digital imaging. Two hundred images belonging to 40 patients previously diagnosed by an specialist were tested. The method was demonstrated to be 88 % accurate in esotropias identification (ET), 100 % for exotropias (XT), 80.33 % for hypertropias (HT), and 83.33 % for hypotropias (HoT). The overall average error was 5.6Δ and 3.83Δ for horizontal and vertical deviations, respectively, against the measures presented by the specialist.

Differential diagnosis is a method to distinguish between two disorders of similar appearance.

Biomicroscopy provides a view of the exterior of the eye (cornea, sclera, and conjunctiva), the components of the internal chamber (the iris, aqueous, lenses, and their capsules), and even part of the posterior segment (anterior chamber, vitreous, and retina) by means of a suitable lens.

The fundoscopy is an exam of the fundus of the eye.

The tonometry is a measurement of the intra-ocular pressure.

The assessment of the ocular motility is performed by means of the cover test (of the manual occluder) or by the corneal luminous reflection, in which the patient stares at a point (cover test) or light (luminous reflex) to check the deviation of the eyes when looking at near and distant objects.

Alterations in the size of the eye.

Nystagmus are involuntary and repeated rhythmic movements of one or both eyes in some or all view directions.

The Snellen table, also known as Snellen’s optometric scale, is a diagram used to assess the visual acuity of a person.

Virtual image located behind the pupil [23].

Radius intervals used in this work were determined by analysis performed in the image bank used in the tests.

That amount was chosen after performing some tests.

Angle formed by the optical axis and the gaze line.

Computerized examination to measure the corneal surface curvature.

Keratoscopy or computerized corneal topography is an examination through which a qualitative and quantitative analysis of corneal astigmatism may be performed.

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Title: Computer-Aided Methodology for Syndromic Strabismus Diagnosis
Authors: João Dallyson Sousa de Almeida
Aristófanes Corrêa Silva
Jorge Antonio Meireles Teixeira
Anselmo Cardoso Paiva
Marcelo Gattass
Publication date: 01-08-2015
Publisher: Springer US
Published in: Journal of Imaging Informatics in Medicine / Issue 4/2015
Print ISSN: 2948-2925
Electronic ISSN: 2948-2933
DOI: https://doi.org/10.1007/s10278-014-9758-0

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Computer-Aided Methodology for Syndromic Strabismus Diagnosis

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