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

This study has been completed.
Information provided by (Responsible Party):
Sophie JACOB, Institut de Radioprotection et de Surete Nucleaire
ClinicalTrials.gov Identifier:
First received: February 2, 2010
Last updated: April 3, 2015
Last verified: April 2015
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.

Lens Opacities

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Cross-Sectional
Official Title: Study of the Occupational Risk of Radiation-induced Cataracts Among Cardiologists

Resource links provided by NLM:

Further study details as provided by Institut de Radioprotection et de Surete Nucleaire:

Primary Outcome Measures:
  • Lens opacities [ Time Frame: up to 1.5 year ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Visual acuity [ Time Frame: up to 1.5 year ] [ Designated as safety issue: No ]
  • Major eye disorders (glaucoma, etc…) [ Time Frame: up to 1.5 year ] [ Designated as safety issue: No ]

Enrollment: 250
Study Start Date: October 2009
Study Completion Date: March 2011
Primary Completion Date: January 2011 (Final data collection date for primary outcome measure)
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

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).

Ages Eligible for Study:   40 Years to 75 Years
Genders Eligible for Study:   Both
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
  Contacts and Locations
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Please refer to this study by its ClinicalTrials.gov identifier: NCT01061463

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

No publications provided by Institut de Radioprotection et de Surete Nucleaire

Additional publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Sophie JACOB, PhD, Institut de Radioprotection et de Surete Nucleaire
ClinicalTrials.gov Identifier: NCT01061463     History of Changes
Other Study ID Numbers: IRSN-09079
Study First Received: February 2, 2010
Last Updated: April 3, 2015
Health Authority: France: French Data Protection Authority

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

Additional relevant MeSH terms:
Eye Diseases
Lens Diseases

ClinicalTrials.gov processed this record on November 27, 2015