Accommodation Disorders (AD)
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ClinicalTrials.gov Identifier: NCT01329848 |
Recruitment Status :
Completed
First Posted : April 6, 2011
Results First Posted : January 5, 2015
Last Update Posted : January 5, 2015
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Condition or disease |
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Accommodative Insufficiency Ill-sustained Accommodation |
Study Type : | Observational |
Actual Enrollment : | 83 participants |
Observational Model: | Cohort |
Time Perspective: | Prospective |
Official Title: | Using Accommodative Lag to Diagnose Accommodation Disorders |
Study Start Date : | December 2010 |
Actual Primary Completion Date : | December 2012 |
Actual Study Completion Date : | August 2013 |
Group/Cohort |
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discomfort symptoms
level of discomfort symptoms while performing near work
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- Accommodation Lag 5D [ Time Frame: 3 week period ]Lag will be measured at different viewing distances and durations using autorefraction. Accommodation error refers to the difference between the distance where the target is located and where the eyes focus. Lag refers error that is under focussed; lead is error that is over focussed. This distance is measured in diopters, or 1/meter.
- Conlon Symptom Survey [ Time Frame: 3 weeks ]Measures visual discomfort symptoms while doing near work. 23 item survey using a 4-point rating scale (never, occasionally, often, almost always). Total raw score reported on a range from 0 to 69 with higher scores indicating more frequent symptoms.

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Ages Eligible for Study: | 18 Years to 30 Years (Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | Yes |
Sampling Method: | Non-Probability Sample |
Inclusion Criteria:
- older adolescent and young adult
- skilled readers who attend school
- are skilled readers
- have heavy reading demands
Exclusion Criteria:
- Age > 30.
- Abnormal vergence system.
- Dry-eye.
- Uncorrected visual defects or significant ocular pathology.
- Learning disability or low IQ
- Medical conditions that might cause uncomfortable visual symptoms (e.g., migraine headaches, epilepsy, head trauma); sensory defects (e.g., deafness), or neurological conditions (e.g., stuttering) that could impair reading development or oral reading fluency.
- Somatosensory amplification.
- Systemic illness or medication associated with accommodative dysfunction.

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): NCT01329848
United States, California | |
Western University of Health Sciences | |
Pomona, California, United States, 91766 |
Principal Investigator: | Chris Chase, PhD | Western University of Health Sciences |
Responsible Party: | Christopher Chase, Professor of Optometry, Western University of Health Sciences |
ClinicalTrials.gov Identifier: | NCT01329848 |
Other Study ID Numbers: |
1R15EY021021 ( U.S. NIH Grant/Contract ) |
First Posted: | April 6, 2011 Key Record Dates |
Results First Posted: | January 5, 2015 |
Last Update Posted: | January 5, 2015 |
Last Verified: | December 2014 |
Accommodation Reading Autorefraction |