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Related Concept Videos

Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

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Related Experiment Video

Updated: Jun 2, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

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Published on: March 29, 2022

Dynamic visual acuity during walking after long-duration spaceflight.

Brian T Peters1, Chris A Miller, Rachel A Brady

  • 1Wyle Integrated Science and Engineering Group, 1290 Hercules Drive, Houston, TX 77058, USA. brian.peters-1@nasa.gov

Aviation, Space, and Environmental Medicine
|April 13, 2011
PubMed
Summary
This summary is machine-generated.

Astronauts experience reduced dynamic visual acuity (DVA) after spaceflight, impacting gaze control during walking. Recovery varies, with some showing unexpected DVA reductions, similar to prism adaptation studies.

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Area of Science:

  • Space medicine
  • Human physiology
  • Neuroscience

Background:

  • Microgravity exposure alters astronauts' gaze control and eye-head coordination.
  • These changes can affect postflight visual acuity during head and body movement.

Purpose of the Study:

  • To assess dynamic visual acuity (DVA) in astronauts after long-duration spaceflight.
  • To investigate the impact of self-motion on postflight visual performance.

Main Methods:

  • Collected DVA data from 14 astronauts after ~6-month space missions.
  • Measured visual acuity while seated (static) and walking at 6.4 km/h (dynamic) on a treadmill.
  • Utilized a psychophysical threshold detection algorithm to efficiently determine acuity.

Main Results:

  • A mean dynamic acuity decrement of approximately 0.75 eye-chart lines was observed 1 day postflight.
  • Astronauts showed a consistent improvement in DVA performance during the first week after returning to Earth.
  • Individual recovery patterns varied and did not always show daily improvement.

Conclusions:

  • Postflight DVA decrements were observed, particularly during walking.
  • Long-term spaceflight experience influenced re-adaptation, with some astronauts exhibiting DVA reductions similar to prism adaptation.
  • Further research is needed to understand the complex recovery of visual-motor control after spaceflight.