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Vergence control, and over-convergence associated with the extra accommodation required to overcome a hyperopic refractive error, play a role in the onset of accommodative esotropia.The classical explanation for the onset of accommodative esotropia is a compensation of far-sightedness by means of excessive accommodative convergence.Convergence insufficiency is a common problem with the eyes, and is the main culprit behind eyestrain, blurred vision, and headaches. Near point of convergence (NPC) is measured by bringing an object to the nose and observing when the patient sees double, or one eye deviates out. Any NPC value greater than 10 cm is remote, and usually due to high exophoria at near.In addition, recent studies also proved that tungsten spectral energy influences the convergence which can also show an impact on reading and near visual tasks because of its brightness and miosis.Horizontal vergence involves mainly the medial and lateral rectus.In ophthalmology, convergence is the simultaneous inward movement of both eyes toward each other, usually in an effort to maintain single binocular vision when viewing an object.Café Mulu is open daily from 7.30am and last orders by 8.30pm.The cafe is located at Park Head quarters and is an open air restaurant serving a range of local foods including forest vegetables such as ‘Paku fern’ and western dishes.
Proximal vergence is sometimes also called voluntary vergence, which however more generally means vergence under voluntary control and is sometimes considered a fifth type of vergence.Vergence eye movements result from the activity of six extraocular muscles.These are innerved from three cranial nerves: the abducens nerve, the trochlear nerve and the oculomotor nerve.Prolonged reading and working under this lighting can cause convergence disorders and visual fatigue In ophthalmology, divergence is the simultaneous outward movement of both eyes away from each other, usually in an effort to maintain single binocular vision when viewing an object. A number of vergence dysfunctions exist: As a further type of dysfunction there is evidence for a link between a vergence abnormality in which there is a reversed crossing of foveal projection such that a foveal convergence stimulus is executed as a divergence movement (in place of a convergence movement) and the occurrence of schizophrenia.
In this case both conditions are amenable to treatment by non-neuroleptic methods.Exaggerated convergence is called cross eyed viewing (focusing on the nose for example) .