What question did this study set out to answer?

To directly quantify in vivo mechanical tension in human horizontal rectus muscles during unrestricted fixation, pursuit, and saccadic eye movements.

February 1, 1975The Journal of PhysiologyOpen Access

Muscle tension during unrestrained human eye movements.

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Authors

CCCarter C. CollinsUniversity of the Pacific DOD. M. O'MearaPacific Tower ASAlan B. ScottUniversity of Minnesota

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Implication

Physiological study measures horizontal rectus muscle tensions during unrestricted gaze in strabismus patients, defining mechanical force requirements for human ocular motility.

Key Points

To directly quantify in vivo mechanical tension in human horizontal rectus muscles during unrestricted fixation, pursuit, and saccadic eye movements.
Implanted miniature force transducers in series between horizontal rectus tendons and scleral insertions in four strabismus patients (N=4).
Simultaneously and continuously recorded muscle tensions during unrestricted fixation, smooth following movements, and saccades across various gaze angles.
Static fixation tension displayed a parabolic relationship with eye position, ranging from 8–12 g at 15 degrees outside the muscle's field of action to approximately 40 g at extreme gaze within its field.
Saccadic movements required an initial isometric rise followed by an isotonic increment of 15–25 g above fixation tension, while antagonist muscles showed an unexpected tension peak at saccade onset.
Plotting dynamic tension limits against eye position established an operational envelope for ocular motility, bounded below by the parabolic static fixation curve.

Cite This Study

Collins et al. (1975) studied this question.

synapsesocial.com/papers/6a71c463abc331a85807b013 https://doi.org/10.1113/jphysiol.1975.sp010850

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Implication

Physiological study measures horizontal rectus muscle tensions during unrestricted gaze in strabismus patients, defining mechanical force requirements for human ocular motility.

Muscle tension during unrestrained human eye movements.

Discussion

Member takes

Implication

Key Points

Cite This Study

Muscle tension during unrestrained human eye movements.

Discussion

Member takes

Implication

Key Points

Cite This Study

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