Applied Physiology of Eye Movements
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Eye movements are complex, requiring the extraocular muscles to work according to the physiological laws of Hering and Sherington. These govern contraction and relaxation of muscles in groups in a coordinated manner to achieve binocular movements or versions. Uniocular movements are called ductions while binocualr movements are called versions. Conjugate movements are in the same direction whereas disconjugate movements involve either a convergence or divergence of the eyes.