Pemeriksaan Gerak Bola Mata

Summary

This video explains the process of eye movement examination, focusing on testing the extraocular muscles. It covers key methods like the 'versi' (binocular) and 'duksi' (monocular) tests, which assess the symmetry and range of eye movements. Abnormal findings such as nystagmus, strabismus, and nerve dysfunctions are explored. The video also highlights how these tests can detect issues like muscle weakness or paralysis, contributing to diagnoses for conditions like strabismus and cranial nerve disorders. The detailed procedures and interpretations are designed to help in assessing eye health.

Takeaways

• 👁️ Eye movement examination evaluates the strength of extraocular muscles to detect weakness or paralysis.
• 😌 Patients with eye muscle movement disorders may experience fatigue, blurred vision, diplopia, or depth perception issues, but some may be asymptomatic.
• 💪 Six extraocular muscles control eye movements, working synergistically to allow full directional vision and maintain eye alignment.
• 🔄 Eye movement exams include version (binocular) and duction (monocular) tests, with version assessed first.
• 🔹 Version tests measure relative movement of both eyes in six cardinal positions, following Hering's law of equal innervation.
• 📏 Version scoring uses a 9-point scale: 0 is normal, -4 is maximal underaction, and +4 is maximal overaction.
• 🎯 Duction tests assess absolute movement of a single eye; limited range indicates paresis or mechanical restriction.
• ⚖️ Sherrington's law explains that contraction of one muscle requires relaxation of its antagonist, important for duction interpretation.
• 📝 Documentation should include measurements for each eye movement direction, noting any nystagmus or other abnormalities.
• 🚨 Common eye movement abnormalities can be due to strabismus, cranial nerve paresis (III, IV, VI), or trauma causing muscle entrapment.

Q & A

What is the main purpose of the extraocular muscle examination?

The main purpose is to evaluate the strength and function of the extraocular muscles, detect any weakness or paralysis, and identify abnormalities that may affect eye movement.

How many extraocular muscles are there, and what is their function?

There are six extraocular muscles: superior rectus, inferior rectus, lateral rectus, medial rectus, superior oblique, and inferior oblique. They work together to allow eye movement in all directions and maintain alignment.

What is the difference between version and duction examinations?

Version examines the relative movement of both eyes simultaneously (binocular), while duction examines the absolute movement of a single eye (monocular).

What does Hering's Law state, and how is it applied in version testing?

Hering's Law states that yoked muscles in both eyes receive equal neural input. In version testing, this law ensures that corresponding muscles in both eyes contract together to maintain symmetrical movement.

What is the recommended procedure for conducting a version test?

The examiner should wash hands, use adequate lighting, explain the procedure, have the patient follow a fixation object without moving the head, move the object in an H or box pattern, lift the eyelid to observe downward gaze, and assess symmetry of eye movement.

How is overaction and underaction graded in version tests?

Overaction is graded from +1 to +4 based on how much the cornea is covered by the eyelid or deviation observed, while underaction is graded from 0 to -4, with -4 indicating maximal underaction.

What is Sherrington's Law, and why is it important for duction testing?

Sherrington's Law states that when one muscle contracts, its antagonist must relax. This principle is important in duction testing to identify if eye misalignment is due to imbalance between contraction and relaxation of opposing muscles.

How is duction graded, and what does it indicate?

Duction is graded on a 5-point scale: 0 is normal, -4 indicates maximal restriction where the eye cannot move to midline. It helps detect paresis or mechanical restriction of a single muscle.

What are the clinical signs of neurogenic paralysis versus mechanical restriction during duction?

In neurogenic paralysis, movement stops slowly and is most restricted in the primary action of the affected muscle. Mechanical restriction often limits movement in multiple positions, such as elevation and oblique gaze.

Which conditions can cause abnormal eye movements detected in these examinations?

Abnormal eye movements can be seen in strabismus, paresis of cranial nerves III (oculomotor), IV (trochlear), VI (abducens), and trauma causing entrapment of the eye muscles.