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Trial record 12 of 103 for:    cataract AND Astigmatism

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

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: NCT00563667
Recruitment Status : Unknown
Verified July 2010 by Hospital Authority, Hong Kong.
Recruitment status was:  Active, not recruiting
First Posted : November 26, 2007
Last Update Posted : July 7, 2010
Information provided by:
Hospital Authority, Hong Kong

Brief Summary:
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 or disease Intervention/treatment Phase
Pterygium Cataract Astigmatism Procedure: pterygium excision Not Applicable

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 40 participants
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
Study Start Date : December 2003
Estimated Study Completion Date : December 2004

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Cataract

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

Information from the National Library of Medicine

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

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.

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): NCT00563667

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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
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Principal Investigator: Lulu Cheng, Dr Department of DOVS, Prince of Wales Hospital/ The Chinese University of Hong Kong

Additional Information:
Layout table for additonal information Identifier: NCT00563667     History of Changes
Other Study ID Numbers: CRE-2003.353
First Posted: November 26, 2007    Key Record Dates
Last Update Posted: July 7, 2010
Last Verified: July 2010

Keywords provided by Hospital Authority, Hong Kong:

Additional relevant MeSH terms:
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Lens Diseases
Eye Diseases
Refractive Errors
Conjunctival Diseases