A comparative study of the discrepancy in the horizontal white-to-white measurement using Calipers vs Pentacam | ||||
| The Egyptian Journal of Hospital Medicine | ||||
| Article 24, Volume 72, Issue 4, July 2018, Page 4374-4377 PDF (160.44 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejhm.2018.9292 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Yahya Abdulla Hamed Khedr  ; Tamer El-Mekkawi; Moamen Mostafa; Ashraf Soliman
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| Department of Ophthalmology, Faculty of Medicine, Ain Shams University | ||||
| 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. | ||||
| Keywords | ||||
| White to White; Manual Calipers; pentacam | ||||
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