Listing's law: Difference between revisions

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Listing's Law

Listing's Law is a principle in ocular physiology that describes the orientation of the eye when it moves from one position to another. It is named after the German mathematician and physicist Johann Benedict Listing.

Overview

Listing's Law states that the eye rotates around an axis that is perpendicular to both the initial and final lines of sight. This law is crucial for understanding how the extraocular muscles control eye movements and maintain binocular vision.

Historical Background

The concept was first introduced by Johann Benedict Listing in the 19th century. Listing's work laid the foundation for modern ophthalmology and neuro-ophthalmology.

Mechanism

Listing's Law can be mathematically described using quaternions or rotation matrices. The law implies that the eye maintains a specific orientation, known as Listing's plane, which is a theoretical plane that contains all possible axes of rotation for the eye.

Listing's Plane

Listing's plane is a conceptual plane that is perpendicular to the line of sight when the eye is in the primary position. All rotations of the eye can be described as occurring around axes that lie within this plane.

Clinical Significance

Understanding Listing's Law is important for diagnosing and treating disorders of eye movement, such as strabismus and nystagmus. It is also relevant in the design of ophthalmic devices and virtual reality systems that simulate eye movements.

Applications

Listing's Law is applied in various fields, including:

Ophthalmology: For understanding and correcting eye movement disorders.
Neuroscience: To study the neural control of eye movements.
Robotics: In the development of robotic vision systems that mimic human eye movements.

Limitations

While Listing's Law provides a useful framework for understanding eye movements, it does not account for all possible eye positions, especially in cases of pathological eye movements or when the head is tilted.

External Links

[Ocular Physiology on WikiMD](https://www.wikimd.com/wiki/Ocular_physiology)
[Neuro-Ophthalmology Resources](https://www.wikimd.com/wiki/Neuro-ophthalmology)

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-== Listing's Law ==
+Listing's Law
-Listing's Law, also known as the "Law of Listing," is a fundamental principle in ophthalmology and neurology that describes the relationship between eye movements and the orientation of the head. It was first formulated by the German ophthalmologist Johann Friedrich Horner in 1867 and later refined by the Dutch ophthalmologist Diederik Johannes Korteweg Listing in 1873.
+'''Listing's Law''' is a principle in [[ocular physiology]] that describes the orientation of the eye when it moves from one position to another. It is named after the German mathematician and physicist [[Johann Benedict Listing]].
-=== Definition ===
+==Overview==
+Listing's Law states that the eye rotates around an axis that is perpendicular to both the initial and final lines of sight. This law is crucial for understanding how the [[extraocular muscles]] control eye movements and maintain [[binocular vision]].
-Listing's Law states that during normal eye movements, the orientation of the eye is determined by the combination of the rotation around the visual axis (torsion), the elevation or depression (elevation), and the rotation around the horizontal axis (horizontal rotation). These three components of eye movement are interrelated and work together to maintain a stable visual perception.
+==Historical Background==
+The concept was first introduced by Johann Benedict Listing in the 19th century. Listing's work laid the foundation for modern [[ophthalmology]] and [[neuro-ophthalmology]].
-=== Explanation ===
+==Mechanism==
+Listing's Law can be mathematically described using [[quaternions]] or [[rotation matrices]]. The law implies that the eye maintains a specific orientation, known as [[Listing's plane]], which is a theoretical plane that contains all possible axes of rotation for the eye.
-According to Listing's Law, the eye rotates around a fixed axis called the Listing's axis. This axis is not aligned with the visual axis, which is the line connecting the fovea (the central point of the retina) to the fixation point. Instead, the Listing's axis is tilted with respect to the visual axis, resulting in a specific relationship between eye movements and head orientation.
+===Listing's Plane===
+Listing's plane is a conceptual plane that is perpendicular to the line of sight when the eye is in the primary position. All rotations of the eye can be described as occurring around axes that lie within this plane.
-When the head is in a neutral position, the eyes are aligned with the head and the Listing's axis is parallel to the visual axis. As the head rotates, the eyes move in a coordinated manner to maintain a stable visual perception. The rotation around the horizontal axis (horizontal rotation) allows the eyes to move horizontally, while the rotation around the visual axis (torsion) and the elevation or depression (elevation) enable vertical eye movements.
+==Clinical Significance==
+Understanding Listing's Law is important for diagnosing and treating disorders of eye movement, such as [[strabismus]] and [[nystagmus]]. It is also relevant in the design of [[ophthalmic devices]] and [[virtual reality]] systems that simulate eye movements.
-=== Clinical Significance ===
+==Applications==
+Listing's Law is applied in various fields, including:
+* [[Ophthalmology]]: For understanding and correcting eye movement disorders.
+* [[Neuroscience]]: To study the neural control of eye movements.
+* [[Robotics]]: In the development of robotic vision systems that mimic human eye movements.
-Listing's Law has important clinical implications in the field of ophthalmology and neurology. It helps explain various eye movement disorders and provides a basis for understanding the mechanisms underlying binocular vision and stereopsis.
+==Limitations==
+While Listing's Law provides a useful framework for understanding eye movements, it does not account for all possible eye positions, especially in cases of [[pathological]] eye movements or when the head is tilted.
-Disorders affecting the normal functioning of Listing's Law can lead to abnormal eye movements, such as strabismus (misalignment of the eyes), nystagmus (involuntary eye movements), and ocular torticollis (abnormal head posture). Understanding Listing's Law is crucial for diagnosing and treating these conditions.
+==See Also==
+* [[Ocular motility]]
+* [[Hering's law of equal innervation]]
+* [[Donder's law]]
-=== Application in Ophthalmic Surgery ===
+==External Links==
+* [Ocular Physiology on WikiMD](https://www.wikimd.com/wiki/Ocular_physiology)
+* [Neuro-Ophthalmology Resources](https://www.wikimd.com/wiki/Neuro-ophthalmology)
-Listing's Law is also applied in ophthalmic surgery, particularly in procedures involving extraocular muscles. Surgeons use the principles of Listing's Law to determine the appropriate amount and direction of muscle repositioning to correct eye misalignment. By considering the relationship between eye movements and head orientation, surgeons can achieve better surgical outcomes and improve binocular vision.
+{{Ophthalmology}}
+{{Neuroscience}}
-=== Conclusion ===
-Listing's Law is a fundamental principle in ophthalmology and neurology that describes the relationship between eye movements and head orientation. It provides a framework for understanding normal eye movements, diagnosing eye movement disorders, and guiding ophthalmic surgical procedures. By studying and applying Listing's Law, researchers and clinicians continue to advance our understanding of the complex mechanisms underlying vision and eye movement control.
-== See Also ==
-* [[Ophthalmology]]
-* [[Neurology]]
-* [[Strabismus]]
-* [[Nystagmus]]
-* [[Stereopsis]]
-== References ==
-<references>
-<ref>Horner JF. Über die Bewegungen des menschlichen Auges. Arch Ophthalmol. 1867;13:265–290.</ref>
-<ref>Listing D. Ueber die Beziehungen der Bogengänge des Ohrlabyrinths zu den Bewegungen der Augen. Arch Ophthalmol. 1873;19:81–99.</ref>
-</references>
 [[Category:Ophthalmology]]
-[[Category:Neurology]]
+[[Category:Neuroscience]]
-[[Category:Eye movement]]
+[[Category:Vision]]
-[[Category:Medical principles]]
+[[Category:Eye physiology]]