Binocular Summation and Control of Intermittent Exotropia

Visual suppression in intermittent exotropia during binocular alignment.

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...

Clinical exhibition of increased accommodative loads for binocular fusion in patients with basic intermittent exotropia

BACKGROUND To investigate the accommodative loads change needed to maintain binocular fusion in patients with intermittent exotropia (IXT). METHODS Seventeen consecutive patients with basic IXT and 15 normal controls were recruited. The WAM-5500 autorefractor (GrandSeiko, Fukuyama, Japan) was used to measure refractive error (D) under binocular and monocular viewing conditions at 6 m, 50 cm, ...

Binocular summation of chance decisions

Seeing with two eyes usually helps one respond faster. Here we show that with ambiguous stimuli, binocular viewing can paradoxically slow down reaction time. This is explained by the observers basing their decision on a noisy neuronal representation within the visual system, with the added noise breaking the symmetry between the two possible interpretations. Binocular integration improves the r...

Binocular Summation within the Binocular Visual Field

To study the influence of binocular summation on the threshold values of the central visual field in normal subjects, the authors modified the Octopus 201 by combining it with the space synoptophore. They tested ten normal subjects between 20 and 30 years of age. A space synoptophore was built into the cupola of the Octopus 201 so that the authors could confirm the conditions of binocular visio...

Evaluation and treatment of intermittent exotropia.