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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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Updated: Apr 1, 2026

Retinal and Choroidal Thickness Changes in Populations with Helicobacter pylori Infection by Swept-Source Optical Coherence Tomography
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Retinal and Choroidal Thickness Changes in Populations with Helicobacter pylori Infection by Swept-Source Optical Coherence Tomography

Published on: November 1, 2024

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Regional Changes in Choroidal Thickness Associated With Accommodation.

Emily C Woodman-Pieterse, Scott A Read, Michael J Collins

    Investigative Ophthalmology & Visual Science
    |October 8, 2015
    PubMed
    Summary
    This summary is machine-generated.

    The choroid thins during accommodation, particularly in the temporal regions. This thinning is linked to changes in smooth muscle cells within the uvea.

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    Area of Science:

    • Ophthalmology
    • Optical Coherence Tomography
    • Ocular Physiology

    Background:

    • Accommodation is the eye's ability to change focus.
    • Choroidal thickness (ChT) plays a role in ocular health.
    • Understanding ChT changes during accommodation is crucial for eye physiology research.

    Purpose of the Study:

    • To measure choroidal thickness (ChT) changes in the posterior pole during accommodation.
    • To investigate the impact of varying accommodative demands on ChT using enhanced-depth imaging optical coherence tomography (OCT).

    Main Methods:

    • Forty young adults underwent ocular biometry and Spectralis OCT imaging.
    • Choroidal thickness was measured at 0, 3, and 6 diopters (D) of accommodation.
    • A Badal optometer system facilitated measurements under controlled accommodative conditions.

    Main Results:

    • Significant choroidal thinning occurred at 6 D accommodation, averaging -5 ± 7 μm (subfoveal) and more in parafoveal regions.
    • Temporal and inferotemporal meridians showed the greatest thinning (-9 ± 12 μm and -8 ± 8 μm, respectively).
    • Axial length increased with accommodation, showing a weak negative association with choroidal thinning.

    Conclusions:

    • A significant, albeit small, choroidal thinning was observed at 6 D accommodation.
    • The greatest thinning occurred in the temporal and inferotemporal parafoveal regions, increasing with eccentricity.
    • Regional variations suggest nonvascular smooth muscle in the uvea may drive choroidal thinning during accommodation.