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When both eyes focus on a near object, three reactions occur simultaneously in response to the stimulus. These are collectively known as the eye''s "Near Triad":
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Convergence
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Lens accommodation
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Pupillary constriction
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These three structural changes work together to maintain clear binocular vision and optimize near vision.
Pupillary constriction is related to the accommodation process, helping increase depth of focus and improve near vision clarity.
As the distance to the object changes, the eye adjusts its focusing state to maintain a clear image.
In the context of vision and visual perception, fusion refers to the brain combining slightly different images received from each eye.
