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eye muscles

1. (extrinsic eye muscles) the muscles that move the eye within the eye socket. There are three pairs: (a) the superior rectus and inferior rectus, (b) the lateral rectus and medial rectus, and (c) the superior oblique and inferior oblique.

2. (intrinsic eye muscles) the muscles that move structures within the eye itself. They include the ciliary muscles, which alter the shape of the lens during accommodation, and the muscles of the iris, which change the size of the pupil.

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Psychology term of the day

February 26th 2024



n. red–green color blindness in which the deficiency is due to absence of the cone photopigment sensitive to green light, resulting in loss of green sensitivity and confusion between red and green (see dichromatism). The condition may be unilateral (i.e., color vision may be normal in one eye). See also protanopia.