ABSTRACT In awake patients the rectus muscles exert about 15 grams force on the globe. Stiffness of orbital tissues to rotation is nearly linear and is about 0.5 gm/degree, Stiffness of rectus muscles to rotation is about 1.0 gm/degree, and is the same from 30° of abduction to 30° of adduction. These values can be separately determined. The balance between them should help predict the type and amount of surgery required to correct an imbalance.
Collins et al. (Tue,) studied this question.