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9292

A comparative study of the discrepancy in the horizontal white-to-white measurement using Calipers vs Pentacam

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Last updated: 24 Dec 2024

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Abstract

Background: The accurate measurement of the horizontal corneal white-to-white (WTW) diameter is essential and has multiple applications in the field of ophthalmology whether medical or surgical. There are many means of measuring the horizontal white-to-white, which includes the Pentacam, the IOL Master and Manual Calipers. Both the Pentacam and Manual Calipers measure the external white-to-white diameter, whereas the IOL Master measures the internal white-to-white diameter.
Objective: The aim of this study is to measure the accuracy of the Pentacam white-to-white camera in measuring the horizontal corneal WTW diameter in comparison to the Manual Calipers, which is considered to be the basic standard.
Patients and Methods: The study was a cross sectional one, conducted at Maghrabi Eye Hospital, Cairo, Egypt. It was conducted in accordance with the ethical standards stated by the Ethical Committee of Ain Shams University. Informed consent was obtained from each participant following the explanation of the academic nature of the study.
Results: Our study compared the accuracy of the Pentacam HR to the Manual Calipers and found a strong correlation between both methods regarding all parameters. A difference of 0.44 ± 0.17 mm was found between the manual calipers and the Pentacam (HVID Automated) measurements and a lesser difference of 0.24 ± 0.27 mm when comparing the manual calipers with the Pentacam manual digital calipers. On the other hand, the difference between the 2 methods of the Pentacam measurement used was 0.19 ± 0.13 mm. All of which, showed a highly significant correlation.
Conclusion: The Pentacam gives larger WTW measurements than the manual calipers as it relies on the gray scale analysis of the HVID in the iris image display.

DOI

10.21608/ejhm.2018.9292

Keywords

White to White, Manual Calipers, pentacam

Authors

First Name

Yahya

Last Name

Khedr

MiddleName

Abdulla Hamed

Affiliation

Department of Ophthalmology, Faculty of Medicine, Ain Shams University

Email

yahya_khedr@hotmail.com

City

-

Orcid

-

First Name

Tamer

Last Name

El-Mekkawi

MiddleName

-

Affiliation

Department of Ophthalmology, Faculty of Medicine, Ain Shams University

Email

-

City

-

Orcid

-

First Name

Moamen

Last Name

Mostafa

MiddleName

-

Affiliation

Department of Ophthalmology, Faculty of Medicine, Ain Shams University

Email

-

City

-

Orcid

-

First Name

Ashraf

Last Name

Soliman

MiddleName

-

Affiliation

Department of Ophthalmology, Faculty of Medicine, Ain Shams University

Email

-

City

-

Orcid

-

Volume

72

Article Issue

4

Related Issue

1779

Issue Date

2018-07-01

Receive Date

2018-05-24

Publish Date

2018-07-01

Page Start

4,374

Page End

4,377

Print ISSN

1687-2002

Online ISSN

2090-7125

Article File

EJHM_Volume 72_Issue 4_Pages 4374-4377.pdf

PDF . 164.3kB

Link

https://ejhm.journals.ekb.eg/article_9292.html

Detail API

https://ejhm.journals.ekb.eg/service?article_code=9292

Order

24

Type

Original Article

Type Code

606

Publication Type

Journal

Publication Title

The Egyptian Journal of Hospital Medicine

Publication Link

https://ejhm.journals.ekb.eg/

MainTitle

A comparative study of the discrepancy in the horizontal white-to-white measurement using Calipers vs Pentacam

Details

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Article

Created At

22 Jan 2023