Universidad Complutense de Madrid
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Visual suppression in intermittent exotropia during binocular alignment.

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Serrano Pedraza, Ignacio y Manjunath, Vina y Osunkunle, Olaoluwakitan y Clarke, Michael P y Read, Jenny C A (2011) Visual suppression in intermittent exotropia during binocular alignment. Investigative ophthalmology & visual science, 52 (5). pp. 2352-64. ISSN 1552-5783

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URL Oficial: http://dx.doi.org/10.1167/iovs.10-6144




Resumen

PURPOSE

To investigate the cortical mechanisms that prevent diplopia in intermittent exotropia (X(T)) during binocular alignment (orthotropia).

METHODS

The authors studied 12 X(T) patients aged 5 to 22 years. Seventy-five percent had functional stereo vision with stereoacuity similar to that of 12 age-matched controls (0.2-3.7 min arc). Identical face images were presented to the two eyes for 400 ms. In one eye, the face was presented at the fovea; in the other, offset along the horizontal axis with up to 12° eccentricity. The task was to indicate whether one or two faces were perceived.

RESULTS

All X(T) patients showed normal diplopia when the nonfoveal face was presented to nasal hemiretina, though with a slightly larger fusional range than age-matched controls. However, 10 of 12 patients never experienced diplopia when the nonfoveal face was presented to temporal hemiretina (i.e., when the stimulus simulated exodeviation). Patients showed considerable variability when the single image was perceived. Some patients suppressed the temporal stimulus regardless of which eye viewed it, whereas others suppressed a particular eye even when it viewed the foveal stimulus. In two patients, the simulated exodeviation might have triggered a shift from normal to anomalous retinal correspondence.

CONCLUSIONS

Antidiplopic mechanisms in X(T) can be reliably triggered by purely retinal information during orthotropia, but the nature of these mechanisms varies between patients.


Tipo de documento:Artículo
Palabras clave:Child, diplopia, Face, Perception, Eye, Nose
Palabras clave (otros idiomas):Niño, Miopía, Cara, Percepción visual, Cara, Ojo, Nariz
Materias:Ciencias Biomédicas > Psicología > Psicología experimental
Ciencias Biomédicas > Psicología > Percepción
Ciencias Biomédicas > Óptica y optometría > Óptica oftálmica
Código ID:36287
Depositado:11 Nov 2016 14:38
Última Modificación:11 Nov 2016 14:38

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