Understanding Visual Confusion Using Stereoscopic Displays

Mass Eye and Ear

Status: Completed

Conditions: Diplopia; Monocular Diplopia; Binocular Vision Suppression; Binocular; Fusion, With Defective Stereopsis

Treatments: Behavioral: Bilateral monocular visual confusion (bilateral see-through); Behavioral: Binocular visual confusion (unilateral opaque); Behavioral: Unilateral monocular visual confusion (unilateral see-through)

Study type: Interventional

Funder types: Other; NIH

Identifiers

NCT04957745

R01EY031777 (U.S. NIH Grant/Contract)

2021P001757

Details and patient eligibility

About

In this research study we want to test how people understand a visual scene when the same image is presented to both the eyes, but portions of these images are altered in terms of contrast, depth or in some cases motion.

Enrollment: 13 patients

Sex: All

Ages: 14+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Better than 20/40 visual acuity in the worse eye
• No restrictions of the peripheral visual field: (at least 60 degrees vertically and 40 degrees horizontally)
• At least 14 years of age (no upper age limit)
• Able to give voluntary, informed consent
• Able to understand English
• Binocular vision parameters within normal limits (Stereopsis ≤ 100 arc sec on any stereo test)

Exclusion criteria

• Patients with any physical or mental disabilities, including cognitive dysfunction, balance problems, or other deficits that could impair their ability to respond to the stimuli presented in this study will be excluded
• Being unable to complete sessions lasting 2-3 hours

Trial design

Primary purpose: Basic Science

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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13 participants in 1 patient group

Visual confusion

Experimental group

Description:

Participants viewed peripheral targets in three different visual confusion conditions (three interventions): binocular visual confusion (unilateral opaque target), unilateral monocular visual confusion (unilateral see-through target), and bilateral monocular visual confusion (bilateral see-through target). Each intervention was presented twice in a randomized order, resulting in a total of six trials. During each trial, a peripheral target was presented in front of a forward-moving background for one minute. Participants were instructed to hold down the controller button while the target was visible and release it when a third or more of the target disappeared. After each trial, participants could take a brief break before the next trial in a different visual confusion condition was presented in a randomized order.

Treatment:

Behavioral: Unilateral monocular visual confusion (unilateral see-through)

Behavioral: Binocular visual confusion (unilateral opaque)

Behavioral: Bilateral monocular visual confusion (bilateral see-through)