Visual Discomfort and Reading

This study has been completed.
Sponsor:
Collaborator:
Information provided by:
Southern California College of Optometry
ClinicalTrials.gov Identifier:
NCT00402155
First received: November 17, 2006
Last updated: November 11, 2009
Last verified: January 2009
  Purpose

Reading can be an uncomfortable and difficult task for some people. Symptoms include unpleasant somatic and perceptual effects, such as eye-strain, headache, and blurred text, despite normal visual acuity. This condition has been called Visual Discomfort, but little is known about the symptoms and frequency of reading problems associated with this disorder. Several studies have proposed that Visual Discomfort is caused by increased noise in the visual system due to spreading cortical activation across different spatial frequency channels. This study examines the prevalence and severity of visual discomfort in a college student population and tests the noisy visual system hypothesis.


Condition Intervention
Visual Fatigue
Behavioral: Stress on visual discomfort

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Prospective
Official Title: Visual Discomfort and Reading

Further study details as provided by Southern California College of Optometry:

Estimated Enrollment: 100
Study Start Date: July 2004
Study Completion Date: December 2008
Groups/Cohorts Assigned Interventions
1
Normal subjects
Behavioral: Stress on visual discomfort
Effects of visual discomfort are measured by contrast sensitivity, ERGs, and accommodative stability.
2
Reading discomfort subjects
Behavioral: Stress on visual discomfort
Effects of visual discomfort are measured by contrast sensitivity, ERGs, and accommodative stability.

  Show Detailed Description

  Eligibility

Ages Eligible for Study:   17 Years to 30 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population

Subjects will be chosen from the student population and Claremont McKenna College.

Criteria

Inclusion Criteria:

  • normal College age subjects with low visual discomfort scores on the Conlon visual discomfort survey.
  • normal College age subjects with high visual discomfort scores on the Conlon visual discomfort survey.

Exclusion Criteria:

  • English as a second language, uncorrected visual defects, reading disabilities, medical conditions that might cause uncomfortable visual symptoms, strabismus, stereopsis less than 70 seconds of arc, any ocular pathology, color vision deficiency, IQ less than 90.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00402155

Locations
United States, California
Claremont McKenna College
Claremont, California, United States, 91711
Sponsors and Collaborators
Southern California College of Optometry
Investigators
Principal Investigator: Chris Chase, PhD Claremont McKenna College
Study Director: William H. Ridder,III, OD, PhD Southern California College of Optometry
Study Director: Eric Borsting, OD, MS Southern California College of Optometry
  More Information

No publications provided

Responsible Party: William Ridder, Southern California College of Optometry
ClinicalTrials.gov Identifier: NCT00402155     History of Changes
Other Study ID Numbers: SCCO2-2218, NEI EY015922
Study First Received: November 17, 2006
Last Updated: November 11, 2009
Health Authority: United States: Institutional Review Board

Keywords provided by Southern California College of Optometry:
electroretinogram
visual evoked potential
contrast sensitivity

Additional relevant MeSH terms:
Asthenopia
Eye Diseases

ClinicalTrials.gov processed this record on October 23, 2014