Occupational Cataracts and Lens Opacities in Interventional Cardiology : the O'CLOC Study

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. Identifier: NCT01061463
Recruitment Status : Completed
First Posted : February 3, 2010
Last Update Posted : April 6, 2015
Information provided by (Responsible Party):
Sophie JACOB, Institut de Radioprotection et de Surete Nucleaire

Brief Summary:
The purpose of this study is to test the existence of an increased risk of cataracts among interventional cardiologists as compared to cardiologists not exposed to X-rays.

Condition or disease
Cataracts Lens Opacities

Detailed Description:
This cross-sectional study includes cardiologists aged > 40 years: a group of interventional cardiologists (coronary interventionists and electrophysiologists) and a group of unexposed workers (including cardiologists). Individual information, including risk factors of cataracts (age, diabetes, myopia, etc. ...), are collected during a telephone interview. For the exposed group, a specific section of the questionnaire is focused on the occupational history, the description of the procedures (type, frequency, radiation protection tool) and will be used for the classification into "comparable exposure level" groups according to estimates of cumulative dose. For all participants, eye examinations are performed to specifically detect cataracts even in the early stages (lens opacities, LOCS III according to the international standard classification).

Study Type : Observational
Actual Enrollment : 250 participants
Observational Model: Case Control
Time Perspective: Cross-Sectional
Official Title: Study of the Occupational Risk of Radiation-induced Cataracts Among Cardiologists
Study Start Date : October 2009
Actual Primary Completion Date : January 2011
Actual Study Completion Date : March 2011

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Cataract

Exposed group
French coronary interventional cardiologists and cardiologists specializing in cardiac arrhythmias treatments (electrophysiologists), occupationally exposed to X-Rays
Unexposed group
French non-interventional cardiologists and non medical workers, not occupationally exposed to X-Rays

Primary Outcome Measures :
  1. Lens opacities [ Time Frame: up to 1.5 year ]

Secondary Outcome Measures :
  1. Visual acuity [ Time Frame: up to 1.5 year ]
  2. Major eye disorders (glaucoma, etc…) [ Time Frame: up to 1.5 year ]

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Ages Eligible for Study:   40 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Interventional and non-interventional cardiologists from public and private French hospitals/facilities, both groups of cardiologists being matched for age and gender.

Inclusion Criteria:

  • aged at least 40 yrs old
  • for interventional cardiologists: cumulated number of procedures > 2000

Exclusion Criteria:

  • previous history of medical radiation exposure for radiotherapy or brain scans
  • for non-interventional cardiologists: occupational history of interventional cardiologist

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 identifier (NCT number): NCT01061463

Fontenay-aux-Roses, France, 92262
Sponsors and Collaborators
Sophie JACOB
Principal Investigator: Sophie JACOB, PhD. Institut de Radioprotection et de Surete Nucleaire

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Sophie JACOB, PhD, Institut de Radioprotection et de Surete Nucleaire Identifier: NCT01061463     History of Changes
Other Study ID Numbers: IRSN-09079
First Posted: February 3, 2010    Key Record Dates
Last Update Posted: April 6, 2015
Last Verified: April 2015

Keywords provided by Sophie JACOB, Institut de Radioprotection et de Surete Nucleaire:
Radiation cataracts
Lens opacities
Interventional Cardiologists

Additional relevant MeSH terms:
Lens Diseases
Eye Diseases