The baseline convergence maintained by the tonic contraction of the extraocular muscles, primarily the medial rectus muscles, which contributes to the distance phoria.
The baseline convergence maintained by the tonic contraction of the extraocular muscles, primarily the medial rectus muscles, which contributes to the distance phoria.
tonic convergence
Sources
Cacho-Martínez, P., García-Muñoz, Á., & Ruiz-Cantero, M. T. (2016). Extraocular Muscles Tension, Tonus, and Proprioception in Infantile Strabismus: Role of the Oculomotor System. BioMed Research International, 2016, 1-11. https://doi.org/10.1155/2016/6965658
Rouse, M. W., Borsting, E. J., Mitchell, G. L., Scheiman, M., Barnhardt, C., Berman, E., … & Kulp, M. T. (2004). Accommodative and vergence dysfunction. Optometric Clinical Practice Guidelines, 1-57. https://www.aoa.org/AOA/Documents/Practice%20Management/Clinical%20Guidelines/Consensus-based%20guidelines/Care%20of%20Patient%20with%20Accommodative%20and%20Vergence%20Dysfunction.pdf