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Effect of Pterygium Excision on Intraocular Lens Power Calculation for Subsequent Cataract Operation

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified July 2010 by Hospital Authority, Hong Kong.
Recruitment status was:  Active, not recruiting
Sponsor:
ClinicalTrials.gov Identifier:
NCT00563667
First Posted: November 26, 2007
Last Update Posted: July 7, 2010
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:
Hospital Authority, Hong Kong
  Purpose
Pterygium is known to induce with-the-rule astigmatism. Excision of pterygium will steepen the cornea and reduce corneal astigmatism. We postulate that the alteration of keratometry reading will indirectly affect the IOL power calculation in cases with concurrent pterygium and cataract. Concurrent pterygium and cataract is common in Hong Kong and other tropical regions. The effect of pterygium excision on intraocular lens power calculation is investigated.

Condition Intervention
Pterygium Cataract Astigmatism Procedure: pterygium excision

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Effect of Pterygium Excision on IOL Power Calculation: Concurrent Cataract and Pterygium

Resource links provided by NLM:


Further study details as provided by Hospital Authority, Hong Kong:

Primary Outcome Measures:
  • IOL power [ Time Frame: 1 and 3 months post pterygium excision ]
  • Astigmatism [ Time Frame: 1 and 3 months post pterygium excision ]

Estimated Enrollment: 40
Study Start Date: December 2003
Estimated Study Completion Date: December 2004
  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Criteria

Inclusion Criteria:

  • All cases with concomitant cataract and primary pterygium, which are indicated for surgery.

Exclusion Criteria:

  • Pterygium smaller than 1mm, which is not visually significant.
  • Double headed pterygium
  • Pterygium obscuring visual axis that preclude keratometry or autorefraction measurements.
  • Previous corneal refractive surgery that alter the keratometric power of the cornea.
  • Patients with medical problems that preclude staged ocular surgery, e.g. dementia, heart disease, on warfarin.
  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): NCT00563667


Locations
China
Alice Ho Miu Ling Nethersole Hospital
Hong Kong, China
Hong Kong Eye Hospital
Hong Kong, China
Prince of Wales Hospital
Hong Kong, China
Sponsors and Collaborators
Hospital Authority, Hong Kong
Investigators
Principal Investigator: Lulu Cheng, Dr Department of DOVS, Prince of Wales Hospital/ The Chinese University of Hong Kong
  More Information

Additional Information:
ClinicalTrials.gov Identifier: NCT00563667     History of Changes
Other Study ID Numbers: CRE-2003.353
HARECCTR0500013
First Submitted: November 21, 2007
First Posted: November 26, 2007
Last Update Posted: July 7, 2010
Last Verified: July 2010

Keywords provided by Hospital Authority, Hong Kong:
Pterygium
Cataract
Astigmatism

Additional relevant MeSH terms:
Cataract
Astigmatism
Pterygium
Lens Diseases
Eye Diseases
Refractive Errors
Conjunctival Diseases