A measure of convergence or divergence of rays
The simultaneous turning of both eyes when focusing
A vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision. When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image is in the centre of the retina in both eyes. To look at an object closer by, the eyes rotate towards each other, while for an object farther away they rotate away from each other. Exaggerated convergence is called cross eyed viewing . When looking into the distance, the eyes diverge until parallel, effectively fixating the same point at infinity. Vergence movements are closely connected to accommodation of the eye. Under normal conditions, changing the focus of the eyes to look at an object at a different distance will automatically cause vergence and accommodation, sometimes known as the accommodation-convergence reflex. As opposed to the 500°/s velocity of saccade movements, vergence movements are far slower, around 25°/s. The extraocular muscles may have two types of fiber each with its own nerve supply, hence a dual mechanism.
The numerical value of vergence in Chaldean Numerology is: 7
The numerical value of vergence in Pythagorean Numerology is: 7
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