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

Hospital Authority, Hong Kong40 enrolled

Overview

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.

Study Type

INTERVENTIONAL

Allocation

NON_RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Enrollment

Conditions

Pterygium Cataract Astigmatism

Interventions

pterygium excisionPROCEDURE

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

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.

Locations (3)

Alice Ho Miu Ling Nethersole Hospital

Hong Kong, China

Hong Kong Eye Hospital

Hong Kong, China

Prince of Wales Hospital

Hong Kong, China

Outcomes

Primary Outcomes

IOL power

Time frame: 1 and 3 months post pterygium excision

Astigmatism

Time frame: 1 and 3 months post pterygium excision

Data from ClinicalTrials.gov

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