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'''Horopter''' is a term used in [[visual perception]] and [[optometry]] to describe the locus of points in space that, when fixated, fall on corresponding points on the two [[retina]]s. The concept of the horopter is important in understanding [[binocular vision]] and [[stereopsis]].
{{Short description|An article about the horopter in vision science}}
 
==Horopter==
The '''horopter''' is a concept in [[vision science]] that refers to the locus of points in space that are perceived as being at the same depth as the point of fixation. It is a critical concept in understanding [[binocular vision]] and [[stereopsis]], the perception of depth based on the visual information received from both eyes.
 
[[File:Horopter.png|thumb|right|Diagram illustrating the horopter]]


==Definition==
==Definition==
The horopter is defined as the locus of points in space that, when fixated, fall on corresponding points on the two retinas. This means that when we fixate on a point in space, all the points along the horopter will fall on corresponding points on the two retinas. This is important for [[binocular vision]], as it allows us to perceive depth and distance.
In the context of binocular vision, the horopter is defined as the set of points in the visual field that project to corresponding retinal points in each eye. When an observer fixates on a point, the horopter is the surface in space where objects are seen single and in depth. Objects located on the horopter are perceived as being equidistant from the observer as the fixation point.
 
==Types of Horopters==
There are two primary types of horopters:


==Types of Horopter==
===Theoretical Horopter===
There are several types of horopter, including the empirical horopter, the theoretical horopter, and the nonius horopter. Each of these has a slightly different definition and is used in different contexts.
The theoretical horopter is based on the geometry of the eyes and the assumption that corresponding retinal points are symmetrically distributed. It is often represented as a circle, known as the Vieth-Müller circle, which passes through the fixation point and the nodal points of the eyes.


===Empirical Horopter===
===Empirical Horopter===
The empirical horopter is defined as the locus of points that are perceived as being in the same depth plane as the fixation point. This is determined experimentally by having observers judge the relative depth of points in their visual field.
The empirical horopter is determined through experimental measurements and often deviates from the theoretical horopter. It is typically flatter than the Vieth-Müller circle and can vary depending on individual differences and viewing conditions.


===Theoretical Horopter===
==Importance in Vision==
The theoretical horopter is defined as the locus of points that would fall on corresponding points on the two retinas if the visual system were perfect. This is a theoretical construct that is used to understand the limitations of the visual system.
The concept of the horopter is important for understanding how the brain processes binocular disparity to create a perception of depth. Objects that lie off the horopter will produce retinal disparities, which the brain interprets as depth cues. This is fundamental to [[stereopsis]], allowing humans to perceive the three-dimensional structure of their environment.


===Nonius Horopter===
==Applications==
The nonius horopter is defined as the locus of points that are perceived as being in the same depth plane as the fixation point when one eye is covered. This is used to understand the role of monocular cues in depth perception.
Understanding the horopter has applications in various fields, including [[optometry]], [[ophthalmology]], and [[computer vision]]. It is used in the design of [[stereoscopic displays]] and [[virtual reality]] systems to ensure that images are presented in a way that is comfortable and natural for the viewer.


==Clinical Relevance==
==Related pages==
The concept of the horopter is important in understanding and diagnosing disorders of binocular vision, such as [[strabismus]] and [[amblyopia]]. By understanding the horopter, clinicians can better understand the visual experiences of their patients and can develop more effective treatment strategies.
 
==See Also==
* [[Binocular vision]]
* [[Binocular vision]]
* [[Stereopsis]]
* [[Stereopsis]]
* [[Strabismus]]
* [[Retinal disparity]]
* [[Amblyopia]]
* [[Vieth-Müller circle]]
 
[[Category:Optometry]]
[[Category:Visual perception]]
[[Category:Ophthalmology]]


{{stub}}
[[Category:Vision science]]

Latest revision as of 03:57, 13 February 2025

An article about the horopter in vision science


Horopter[edit]

The horopter is a concept in vision science that refers to the locus of points in space that are perceived as being at the same depth as the point of fixation. It is a critical concept in understanding binocular vision and stereopsis, the perception of depth based on the visual information received from both eyes.

Diagram illustrating the horopter

Definition[edit]

In the context of binocular vision, the horopter is defined as the set of points in the visual field that project to corresponding retinal points in each eye. When an observer fixates on a point, the horopter is the surface in space where objects are seen single and in depth. Objects located on the horopter are perceived as being equidistant from the observer as the fixation point.

Types of Horopters[edit]

There are two primary types of horopters:

Theoretical Horopter[edit]

The theoretical horopter is based on the geometry of the eyes and the assumption that corresponding retinal points are symmetrically distributed. It is often represented as a circle, known as the Vieth-Müller circle, which passes through the fixation point and the nodal points of the eyes.

Empirical Horopter[edit]

The empirical horopter is determined through experimental measurements and often deviates from the theoretical horopter. It is typically flatter than the Vieth-Müller circle and can vary depending on individual differences and viewing conditions.

Importance in Vision[edit]

The concept of the horopter is important for understanding how the brain processes binocular disparity to create a perception of depth. Objects that lie off the horopter will produce retinal disparities, which the brain interprets as depth cues. This is fundamental to stereopsis, allowing humans to perceive the three-dimensional structure of their environment.

Applications[edit]

Understanding the horopter has applications in various fields, including optometry, ophthalmology, and computer vision. It is used in the design of stereoscopic displays and virtual reality systems to ensure that images are presented in a way that is comfortable and natural for the viewer.

Related pages[edit]