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Subjective Image Quality in Stereoscopic Image Modifications (Stereopsis)

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ClinicalTrials.gov Identifier: NCT01624415
Recruitment Status : Completed
First Posted : June 20, 2012
Last Update Posted : July 2, 2012
Sponsor:
Information provided by (Responsible Party):
Gerhard Garhofer, Medical University of Vienna

Study Description
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Brief Summary:

Humans attain binocular vision from the two retinal images of both eyes through a series of sensory and motor processes that culminate in the perception of stereoscopic depth. Looking at a scene creates two slightly different images on the retinas which is due to the eyes' different positions on the head. This so called binocular disparity provides information to calculate depth and therefore enables stereopsis. Physiologically the two retinal images are superimposed and merge into one stereoscopic image.

If one image is presented to one eye in an experimental setting, and a completely different image is presented to the other eye, the investigators visual system, analogous to diplopic vision, is not able to fuse these image stimuli. Instead, a phenomenon called binocular rivalry occurs. Here, both images are seen alternating and the brain can switch back and forth between these images.

The aim of the present study is to investigate the effects of objective changes to image quality on the investigators subjective stereoscopic perception. This psychophysiological testing is done by looking at different images and thereafter by subjective grading of the image quality.

The investigators hypothesize that overlapping image modifications occurring in both eyes are detected immediately, but changes, that are rotated by 90 degrees against each other, should be suppressed and result in one stereoscopic image, reduced in image quality. Whether this also accounts for more detailed images, such as reading cards, is questionable.


Condition or disease
Stereoscopic Vision

Study Design
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Study Type : Observational
Actual Enrollment : 30 participants
Observational Model: Cohort
Time Perspective: Prospective
Study Start Date : June 2012
Actual Primary Completion Date : June 2012
Actual Study Completion Date : June 2012
Groups and Cohorts
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Outcome Measures
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Eligibility Criteria
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Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 35 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
The participants will be selected by the Department of Clinical Pharmacology healthy subjects, male and female, 18-35 years
Criteria

Inclusion Criteria:

  • Men and women aged between 18 and 35 years, nonsmokers
  • Normal findings in the medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant
  • Normal ophthalmic findings, emmetropia or ≤ 1 diopter

Exclusion Criteria:

  • Regular use of medication, abuse of alcoholic beverages, participation in a clinical trial in the 3 weeks preceding the study
  • Treatment in the previous 3 weeks with any drug (except oral contraceptives)
  • Symptoms of a clinically relevant illness in the 3 weeks before the first study day
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01624415


Locations
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Austria
Department of Clinical Pharmacology, Medical University of Vienna
Vienna, Austria, 1090
Sponsors and Collaborators
Medical University of Vienna
More Information
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Responsible Party: Gerhard Garhofer, MD, assco. Prof., Medical University of Vienna
ClinicalTrials.gov Identifier: NCT01624415    
Other Study ID Numbers: OPHT - 190312
First Posted: June 20, 2012    Key Record Dates
Last Update Posted: July 2, 2012
Last Verified: June 2012