Investigative ophthalmology & visual science
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Invest. Ophthalmol. Vis. Sci. · Oct 2003
Nocturnal elevation of intraocular pressure is detectable in the sitting position.
When intraocular pressure (IOP) was monitored in supine healthy young adults throughout a 24-hour period, a diurnal-to-nocturnal elevation of IOP was observed. This study was undertaken to investigate whether a similar elevation of IOP can be detected when experimental subjects are in the sitting position. ⋯ A nocturnal elevation of IOP can be detected in healthy young adults in both the sitting and the supine positions. There is a 24-hour rhythm of sitting IOP that is not different from the 24-hour rhythm of supine IOP.
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Patients with primary microstrabismus have a high degree of binocularity, which suggests that their ocular misalignment may have a sensory rather than an oculomotor origin, as in large-angle strabismus. The purpose of these experiments was to determine whether microstrabismic subjects have sensory abnormalities that could give rise to a small angle of strabismus. ⋯ The data do not support a sensory abnormality as the primary cause of microstrabismus. The results are not compatible with an oculomotor adaptation to an inherent anomalous correspondence or with a strabismus caused by an absence of a class of disparity-selective mechanisms. Thus, just as in large-angle strabismus, the anomalous retinal correspondence and defective stereopsis of microstrabismus appear to be consequences of abnormal visual experience caused by an interocular deviation.