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

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

UNKNOWN

Clinical Phase

NA

Total Enrollment

40 participants

Study Classification

INTERVENTIONAL

Study Start Date

2003-12-31

Study Completion Date

2004-12-31

Brief Summary

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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.

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Detailed Description

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Conditions

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Pterygium Cataract Astigmatism

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

SINGLE_GROUP

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Interventions

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pterygium excision

Intervention Type PROCEDURE

Eligibility Criteria

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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.

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No