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Related Concept Videos

Muscles of the Eye01:20

Muscles of the Eye

The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
Extraocular Muscles
The six extraocular muscles surround the eyeball and control its movements. They are responsible for a wide range of eye motions, including looking up, down, left, right, and rotating...
Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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Botulism

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Cranial Nerves: Types Part I01:14

Cranial Nerves: Types Part I

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Related Experiment Video

Updated: Jul 14, 2026

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer
19:53

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Published on: March 1, 2015

Residual symptomatic superior oblique palsy.

A R Davis1, E Dawson, J P Lee

  • 1Moorfields Eye Hospital, London, UK.

Strabismus
|June 15, 2007
PubMed
Summary

Patients with persistent Superior Oblique (SO) palsy symptoms after initial Inferior Oblique (IO) weakening surgery often require further intervention. Exploring the previously operated IO is recommended, with an 84% success rate for symptom resolution after subsequent procedures.

Area of Science:

  • Ophthalmology
  • Strabismus Surgery
  • Neuro-ophthalmology

Background:

  • Superior Oblique (SO) palsy can lead to persistent symptomatic hyperdeviations.
  • Previous weakening of the ipsilateral Inferior Oblique (IO) muscle is a common initial treatment.
  • Some patients remain symptomatic despite initial IO weakening procedures.

Purpose of the Study:

  • To evaluate the outcomes of patients with residual symptomatic hyperdeviations after prior IO weakening surgery for SO palsy.
  • To identify factors influencing treatment success and recurrence.
  • To propose a management strategy for complex cases.

Main Methods:

  • Retrospective review of 37 patients with symptomatic SO palsy and prior ipsilateral IO weakening surgery.
  • Data collection included pre- and postoperative deviations, ocular motility, symptoms, and surgical interventions.

Related Experiment Videos

Last Updated: Jul 14, 2026

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer
19:53

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Published on: March 1, 2015

  • Analysis of outcomes following repeat IO weakening, SO strengthening, or combined procedures.

    • Main Results:

    • Nine patients (24%) were considered initial failures, with four having masked bilateral IO weakness.
    • Eighty-four percent of patients achieved symptom resolution at final follow-up.
    • Surgical approaches varied, including repeat IO weakening, SO strengthening, or combined surgeries.

    Conclusions:

    • Re-operation on the ipsilateral IO is a viable option for persistent hyperdeviations in SO palsy.
    • A significant proportion of patients may require further surgery to achieve adequate ocular alignment.
    • A structured approach, including exploration of the previously operated IO, is suggested for management.