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Ocular Translation Due to Gravitational Acceleration.

Joseph L Demer1,2,3,4,5, Robert A Clark1,2

  • 1Department of Ophthalmology, University of California, Los Angeles, California, United States.

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Summary
This summary is machine-generated.

Gravity influences human eye position, causing shifts in the orbit. These changes, particularly in the lower eye, affect optic nerve elongation and orbital tissue mechanics.

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Area of Science:

  • Ophthalmology
  • Biomechanics
  • Neuroscience

Background:

  • The precise position of the human globe within the orbit is crucial for visual function.
  • Understanding how external forces, such as gravity, influence ocular structures is important for biomechanical modeling.

Purpose of the Study:

  • To investigate whether gravitational head orientation affects human globe position within the orbit.
  • To quantify the translational changes in eye position due to gravity.

Main Methods:

  • Magnetic resonance imaging (MRI) was used to capture detailed images of the eyes in 11 adult volunteers.
  • Participants were positioned supine (head aligned with gravity) and in lateral decubitus positions (gravity orthogonal to the head).
  • Globe centroid positions were calculated from MRI data to measure ocular translation.

Main Results:

  • In decubitus positions compared to supine, the upper eye shifted anteriorly and medially, while the lower eye shifted anteriorly, laterally, and superiorly.
  • Significant translational magnitudes (over 1 mm) were observed for both upper and lower eyes.
  • Gravity-induced enophthalmos (anteroposterior eye shift) was noted in the supine position.

Conclusions:

  • Gravity demonstrably affects human globe position, causing significant shifts within the orbit.
  • The lower eye experiences greater anterior and lateral translation, leading to more substantial optic nerve elongation.
  • These findings necessitate consideration of gravitational effects in models of eye rotation and orbital tissue mechanics.