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

This study is ongoing, but not recruiting participants.

Sponsored by:	Hospital Authority, Hong Kong
Information provided by:	Hospital Authority, Hong Kong
ClinicalTrials.gov Identifier:	NCT00563667

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

MedlinePlus related topics: Cataract

U.S. FDA Resources

Study Type:	Interventional
Study Design:	Treatment, Non-Randomized, Open Label, Uncontrolled, Single Group Assignment, Safety/Efficacy Study
Official Title:	Effect of Pterygium Excision on IOL Power Calculation: Concurrent Cataract and Pterygium

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

Ages Eligible for Study:	18 Years and older
Genders Eligible for Study:	Both

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

Please refer to this study by its ClinicalTrials.gov identifier: NCT00563667

Locations

China
Prince of Wales Hospital
Hong Kong, China
Alice Ho Miu Ling Nethersole Hospital
Hong Kong, China
Hong Kong Eye 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

HAREC Clinical Trial Registry This link exits the ClinicalTrials.gov site

Study ID Numbers:	CRE-2003.353, HARECCTR0500013
Study First Received:	November 21, 2007
Last Updated:	December 15, 2008
ClinicalTrials.gov Identifier:	NCT00563667
Health Authority:	Hong Kong: Ethics Committee

Keywords provided by Hospital Authority, Hong Kong:

Pterygium
Cataract
Astigmatism

Study placed in the following topic categories:

Eye Diseases
Cataract
Pterygium of the conjunctiva
Lens Diseases

Pterygium
Conjunctival Diseases
Refractive Errors
Astigmatism

ClinicalTrials.gov processed this record on January 14, 2009