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Subjective Image Quality in Stereoscopic Image Modifications (Stereopsis)

This study has been completed.
Information provided by (Responsible Party):
Gerhard Garhofer, Medical University of Vienna Identifier:
First received: June 18, 2012
Last updated: June 28, 2012
Last verified: June 2012

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.

Stereoscopic Vision

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective

Further study details as provided by Medical University of Vienna:

Enrollment: 30
Study Start Date: June 2012
Study Completion Date: June 2012
Primary Completion Date: June 2012 (Final data collection date for primary outcome measure)

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

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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Please refer to this study by its identifier: NCT01624415

Department of Clinical Pharmacology, Medical University of Vienna
Vienna, Austria, 1090
Sponsors and Collaborators
Medical University of Vienna
  More Information

Responsible Party: Gerhard Garhofer, MD, assco. Prof., Medical University of Vienna Identifier: NCT01624415     History of Changes
Other Study ID Numbers: OPHT - 190312
Study First Received: June 18, 2012
Last Updated: June 28, 2012 processed this record on April 26, 2017