title: A new device to assess static ocular torsion.
abstract: In clinical settings, static ocular torsion is assessed by taking a fundus photograph and measuring the angle between a horizontal line and the line connecting the fovea to the head of the optic nerve (centro-cecal axis rotation; CCAR). We developed and tested a system specifically aimed at CCAR measurements, based on low-cost commercial hardware, and that implements an adaptive research algorithm that selects and presents bright dots on a monitor to outline the borders of the blind spot, locate its center, and measure CCAR. We examined 10 healthy subjects who underwent four CCAR measurements to evaluate the reliability of the system and compared our results with those of fundus photographic examination. Our data showed an excyclophoria, with mean ocular torsion of 6.4° in the right and 6.7° in the left eye. These values are in keeping with those in the literature. Moreover, the values of the intraclass correlation coefficients suggest excellent reliability of the technique.
authors.affiliation: Department of Computer and Systems Science, University of Pavia, Pavia, Italy. stefano.ramat@unipv.it
authors.forename: Stefano
authors.initials: S
authors.lastname: Ramat
authors.forename: Alessandro
authors.initials: A
authors.lastname: Nesti
authors.forename: Maurizio
authors.initials: M
authors.lastname: Versino
authors.forename: Silvia
authors.initials: S
authors.lastname: Colnaghi
authors.forename: Catia
authors.initials: C
authors.lastname: Magnaghi
authors.forename: Alessandro
authors.initials: A
authors.lastname: Bianchi
authors.forename: Giorgio
authors.initials: G
authors.lastname: Beltrami
mesh_terms: D000465:Algorithms; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation* / Q000706:statistics & numerical data; D005451:Fluorescein Angiography; D005584:Fovea Centralis / Q000033:anatomy & histology; D005654:Fundus Oculi; D006801:Humans; D009898:Optic Disk / Q000033:anatomy & histology; D015203:Reproducibility of Results; D012399:Rotation; D013285:Strabismus / Q000175:diagnosis; D014785:Vision, Ocular