Prevalence of Dyschromatopsia in Glaucoma Patients
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|ClinicalTrials.gov Identifier: NCT01994564|
Recruitment Status : Withdrawn
First Posted : November 26, 2013
Last Update Posted : November 26, 2013
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Glaucoma is a progressive disease resulting in loss of retinal nerve cells and their axons (retinal nerve fibers). Retinal nerve fibers are ordered in a special manner when they enter the optic nerve. Hence, damage to the retinal nerve fibers by glaucoma results in visual field defects at certain locations. Furthermore, the retinal nerve fiber layers from different receptors for different colors are ordered in a special manner as well. Thus, it is possible that glaucomatous damage causes color vision dysfunction (dyschromatopsia).
At the moment there is disagreement whether dyschromatopsia occurs at early- to mid-stage or only in end-stage glaucoma.
By testing color vision in glaucoma patients the prevalence of dyschromatopsia in glaucoma and in different stages of the disease will be investigated.
|Condition or disease|
|Open Angle Glaucoma|
|Study Type :||Observational|
|Actual Enrollment :||0 participants|
|Official Title:||Prevalence of Dyschromatopsia in Glaucoma Patients|
|Study Start Date :||November 2012|
|Estimated Primary Completion Date :||December 2013|
|Estimated Study Completion Date :||January 2014|
- Result from Ishihara Test [ Time Frame: Visit 1 ]Color vision will be tested once by Ishihara plates. Both eyes will be tested separately.
- Glaucoma stage [ Time Frame: Visit 1 ]Visual field will be tested with 30-2 Humphrey visual field full threshold test. Visual field defects will we graded following the Hodapp-Anderson-Parrish Scale (Hodapp E, Parrish RK, Anderson DR. Classification of Defects in Clinical Decisions in Glaucoma. St. Louis: Mosby, 1993:52-61).
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|Ages Eligible for Study:||18 Years and older (Adult, Older Adult)|
|Sexes Eligible for Study:||All|
|Accepts Healthy Volunteers:||No|
|Sampling Method:||Non-Probability Sample|
- diagnosis of open angle glaucoma
- visual acuity >/= 20/50
- age >/= 18 (no upper limit)
- male or female gender
- other type of glaucoma
- age <18
- other retinal disease (e.g. age related macular degeneration)
- other disease affecting the optic nerve or the retinal nerve fibers
- known color blindness
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): NCT01994564
|United States, Massachusetts|
|Massachusetts Eye & Ear Infirmary|
|Boston, Massachusetts, United States, 02114|
|Principal Investigator:||Douglas J. Rhee, M.D.||Massachusetts Eye & Ear Infirmary, Harvard Medical School, Boston, MA, US|
|Responsible Party:||Massachusetts Eye and Ear Infirmary|
|Other Study ID Numbers:||
|First Posted:||November 26, 2013 Key Record Dates|
|Last Update Posted:||November 26, 2013|
|Last Verified:||July 2012|