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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.
Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...

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Related Experiment Video

Updated: Jun 8, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Three-dimensional optometer III.

T Takeda, Y Fukui, K Ikeda

    Applied Optics
    |September 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    The new three-dimensional optometer III (TDO III) enables simultaneous measurement of accommodation, eye movement, and pupil diameter with head mobility. This compact, wearable device offers high accuracy for ocular function assessment in real-world conditions.

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    Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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    Published on: March 29, 2022

    Related Experiment Videos

    Last Updated: Jun 8, 2026

    Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
    05:14

    Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

    Published on: September 16, 2025

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

    Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

    Published on: March 29, 2022

    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Optometry

    Background:

    • Accurate measurement of ocular functions like accommodation and eye movement is crucial for understanding visual performance.
    • Existing optometry equipment often restricts head and eye movement, limiting real-world applicability.
    • The need for a compact, wearable device capable of measuring multiple ocular parameters simultaneously in natural environments.

    Purpose of the Study:

    • To introduce and evaluate the three-dimensional optometer III (TDO III), a novel head-mounted device.
    • To assess the simultaneous measurement capabilities of TDO III for accommodation, eye movement, pupil diameter, and head movement.
    • To validate the accuracy and performance of TDO III in diverse conditions, including artificial and human eyes.

    Main Methods:

    • Development of the TDO III, a head-mounted optometer integrating accommodation, eye movement, and pupil diameter measurement.
    • Implementation of a counterbalanced design to minimize head loading and allow free head and eye movement.
    • Testing TDO III's measurement range, accuracy, and precision using artificial and human eyes under normal lighting conditions.

    Main Results:

    • TDO III successfully measured accommodation (-12.7 to +26.6 D), pupil diameter (100% change), and eye movements (40° horizontal, 30° vertical).
    • Head movement was permitted within a 200 mm diameter sphere.
    • Achieved high accuracy: ±0.25 D for accommodation, ±0.3 mm for pupil diameter, < ±0.5° for eye angles, ±10 mm for eye position, and ±1° for Cartesian angles.

    Conclusions:

    • The TDO III is a significant advancement for ocular function assessment in real-world settings.
    • Its wearable, head-mounted design allows natural head and eye movements without pupil dilation.
    • TDO III provides accurate and reliable measurements, suitable for various research and clinical applications in ophthalmology and optometry.