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Changes in apical corneal curvature in unilateral primary Pterygium and normal adults using simulated-K and corneal irregularity measurement

Hilmi, Mohd Radzi and Musa, Nur Hidayah and Mohd Kamal, Khairidzan and Che Azemin, Mohd Zulfaezal and Maruziki, Nur Nabilah and Norazmar, Nur Ain and Nasir, Mardhiah Syazwani (2019) Changes in apical corneal curvature in unilateral primary Pterygium and normal adults using simulated-K and corneal irregularity measurement. International Journal Of Allied Health Sciences (IJAHS), 3 (2). pp. 588-594. E-ISSN 2600-8491

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Abstract

Introduction: This paper aimed to describe variation in apical corneal curvature between unilateral primary pterygium and normal adults utilizing simulated-K and corneal irregularity measurement corneal indices. Methods: A total of 100 participants comprise 50 unilateral primary pterygium eyes from 50 patients and 50 normal adults were recruited in this study. Diagnosis and classification of primary pterygium were done by a consultant ophthalmologist (KMK). Standard optometric examinations were performed in all participants. Simulated-K (SimK) and corneal irregularity measurement (CIM) was objectively measured using a corneal topographer. Three measurements based on best image quality for SimK and CIM were taken by single operator in a same visit. Difference for both SimK and CIM parameters between primary pterygium and normal groups were determined via independent T-test. Results: Overall mean and standard deviation (n = 120) of SimK and CIM were found higher in primary pterygium group (9.06 ± 4.49 D and 11.48 ± 3.12) compared to normal (1.63 ± 0.67 D and 0.62 ± 0.24) respectively. Independent T-test results showed significance difference in SimK and CIM values between primary pterygium groups and normal (both P< 0.001). Conclusions: Both SimK and CIM corneal indices can be an important tool in describing and predicting changes on the corneal curvature due to pterygium progression. However, it is worth to note that the detectability of changes in anterior corneal curvature is limited to 5 mm of central corneal curvature.

Item Type: Article (Journal)
Additional Information: 7746/77590
Uncontrolled Keywords: pterygium; morphology; Simulated-K; corneal irregularity measurement; corneal curvature
Subjects: R Medicine > RE Ophthalmology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Allied Health Sciences > Department of Optometry and Visual Science
Depositing User: Dr Mohd Radzi Hilmi
Date Deposited: 09 Jan 2020 15:04
Last Modified: 28 Mar 2020 20:20
URI: http://irep.iium.edu.my/id/eprint/77590

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