This trial is active, not recruiting.

Conditions pterygium, cataract, astigmatism
Treatment pterygium excision
Sponsor Hospital Authority, Hong Kong
Start date December 2003
End date December 2004
Trial size 40 participants
Trial identifier NCT00563667, CRE-2003.353, HARECCTR0500013


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.

United States No locations recruiting
Other countries No locations recruiting

Study Design

Allocation non-randomized
Endpoint classification safety/efficacy study
Intervention model single group assignment
Masking open label
Primary purpose treatment

Primary Outcomes

IOL power
time frame: 1 and 3 months post pterygium excision
time frame: 1 and 3 months post pterygium excision

Eligibility Criteria

Male or female participants at least 18 years old.

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.

Additional Information

Official title Effect of Pterygium Excision on IOL Power Calculation: Concurrent Cataract and Pterygium
Principal investigator Lulu Cheng, Dr
Trial information was received from ClinicalTrials.gov and was last updated in July 2010.
Information provided to ClinicalTrials.gov by Hospital Authority, Hong Kong.