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The state of the two eyes being physically directed toward the same target (binocular fixation). Perfect visual alignment is necessary to achieve single, fused vision and stereopsis (depth perception).
read more about visual alignment ...A misalignment that is only evident when one eye is covered is called a Phoria (latent misalignment). A constant, visible misalignment is called a Tropia (manifest misalignment or strabismus).
Can be caused by problems with the extraocular muscles, innervation by the cranial nerves (III, IV, VI), or central control of the fusion mechanism.
Corrected through prescription prism (to optically shift the image), vision therapy (to train the eye muscles), or, in severe cases, eye muscle surgery.
A common type of manifest misalignment where one or both eyes turn inward toward the nose.
The neurophysiological process that takes the two slightly different images created by aligned eyes and combines them into a single, cohesive image.
Even a small misalignment (phoria) can cause visual fatigue and headaches during prolonged reading as the eyes constantly strain to maintain alignment and fusion.