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Evoked Retinal Response

This study has been terminated.
(Poor enrollment.)
Sponsor:
ClinicalTrials.gov Identifier:
NCT01415453
First Posted: August 12, 2011
Last Update Posted: April 5, 2013
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
Ronald H. Silverman, Columbia University
  Purpose
Retinitis pigmentosa (RP) is the name given to a group of inherited eye diseases that affect the retina (the light-sensitive part of the eye). RP causes the breakdown of photoreceptor cells (cells in the retina that detect light). Photoreceptor cells capture and process light helping us to see. As these cells breakdown and die, people experience progressive vision loss. There is no known cure for retinitis pigmentosa. The investigators have observed that short pulses of focused ultrasound can cause perception of light when directed to spots on the retinal surface. The investigators propose to conduct a study to determine if pulsed ultrasound will stimulate the perception of light in the absence of functional photoreceptors in people with RP

Condition Intervention
Retinitis Pigmentosa Procedure: Ultrasound Stimulus

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: None (Open Label)
Official Title: Evoked Visual Response Using Pulsed Ultrasound

Resource links provided by NLM:


Further study details as provided by Ronald H. Silverman, Columbia University:

Primary Outcome Measures:
  • Phosphene Perception in Response to Ultrasound Pulse. [ Time Frame: Subjects will undergo a single examination of approximately 15 minute duration during which they will report perception of phosphenes during ultrasound exposure. ]
    The investigators will test the hypothesis that compression of retinal nerves by ultrasound force will cause perception of light (phosphenes) in blind subjects lacking functioning photoreceptors (retinitis pigmentosa). With each of two 5 msec ARFI exposures, if the subject either perceived the spark of light (phosphene), then it was documented as a positive response; if they did not, it was marked as a negative response.


Enrollment: 1
Study Start Date: July 2011
Study Completion Date: June 2012
Primary Completion Date: June 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Retinitis Pigmentosa
Subject will have retinitis pigmentosa and will be legally blind in one or both eyes
Procedure: Ultrasound Stimulus
Short pulses of focused ultrasound will be directed at spots on the retinal surface.
Other Name: pulsed ultrasound

Detailed Description:
Patients affected by retinitis pigmentosa (RP) and related diseases suffer loss of vision due to death of photoreceptor cells. The investigators have observed that short pulses of focused ultrasound can cause perception of light (phosphenes) when directed to spots on the retinal surface. If this phenomenon is caused by direct stimulation of the retinal nerves, which seems probable, then it might be possible to use this phenomenon to produce a form of vision in such patients. The investigators propose to conduct a study of a small cohort of patients affected by RP to determine if pulsed ultrasound will evoke a perception of light in the absence of functional photoreceptors.
  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • retinitis pigmentosa
  • legally blind in at least one eye

Exclusion Criteria:

  • unable to lay down on an exam table
  Contacts and Locations
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): NCT01415453


Locations
United States, New York
Columbia University Medical Center
New York, New York, United States, 10032
Sponsors and Collaborators
Columbia University
Investigators
Principal Investigator: Ronald H Silverman, PhD Columbia University
  More Information

Responsible Party: Ronald H. Silverman, Professor of Ophthalmic Science, Columbia University
ClinicalTrials.gov Identifier: NCT01415453     History of Changes
Other Study ID Numbers: AAAI1650
First Submitted: July 25, 2011
First Posted: August 12, 2011
Results First Submitted: June 21, 2012
Results First Posted: April 5, 2013
Last Update Posted: April 5, 2013
Last Verified: March 2013

Keywords provided by Ronald H. Silverman, Columbia University:
retinitis pigmentosa
acoustic radiation force ultrasound
RP
visual field loss
Photoreceptor
Vision loss
retina
progressive vision loss
ultrasound

Additional relevant MeSH terms:
Retinitis
Retinitis Pigmentosa
Retinal Diseases
Eye Diseases
Eye Diseases, Hereditary
Retinal Dystrophies
Retinal Degeneration
Genetic Diseases, Inborn