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Related Concept Videos

Depth Perception and Spatial Vision01:15

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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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Related Experiment Video

Updated: Oct 22, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Virtual extensions improve perception-based instrument alignment using optical see-through devices.

Mohamed Benmahdjoub, Wiro J Niessen, Eppo B Wolvius

    IEEE Transactions on Visualization and Computer Graphics
    |August 27, 2021
    PubMed
    Summary

    Instrument visualization is crucial for surgical alignment tasks using see-through augmented reality (AR) devices. Virtual extensions significantly improved accuracy and reduced user frustration, enhancing surgical navigation.

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    Area of Science:

    • Medical technology and human-computer interaction.
    • Augmented reality (AR) and virtual reality (VR) applications in surgery.

    Background:

    • Accurate instrument alignment is critical in image-guided surgical interventions.
    • Surgeons use patient-specific data and preplanned trajectories for instrument positioning.
    • The effectiveness of different visualization methods in AR surgical navigation requires investigation.

    Purpose of the Study:

    • To evaluate the impact of instrument visualization versus non-visualization on surgical alignment tasks.
    • To compare a virtual extensions approach with realistic and no instrument visualization.
    • To assess user performance and experience using see-through AR devices for instrument alignment.

    Main Methods:

    • 18 volunteers performed instrument alignment tasks under three conditions: no visualization, realistic visualization, and virtual extensions visualization.
    • Tasks were conducted using a see-through device (Microsoft HoloLens 2).
    • Instrument and head positions were recorded; user experience was assessed using NASA-TLX and SUS questionnaires.

    Main Results:

    • Instrument visualization is essential for effective alignment with see-through AR devices.
    • The virtual extensions approach yielded the best performance, with median errors of 2 mm (positional) and 2° (angular).
    • Virtual extensions reduced average head velocity and user frustration levels.

    Conclusions:

    • Virtual extensions enhance instrument alignment performance in AR/VR environments.
    • This approach is particularly beneficial for optical see-through devices in AR-navigated surgical procedures.
    • Virtual extensions can facilitate complex alignment tasks, improving surgical accuracy and user comfort.