alexa Measurement of Corneal Diameter Using Smart Phone Techn
ISSN: 2155-9570

Journal of Clinical & Experimental Ophthalmology
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Research Article

Measurement of Corneal Diameter Using Smart Phone Technology

Mosa Al Harby1*, Mohammed Al Shamrani1 and Deepak P Edward1,2
1King Khaled Eye Specialist Hospital Eye Specialist Hospital Riyadh, Saudi Arabia
2Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA
Corresponding Author : Mosa Al Harby, MD
King Khaled Eye Specialist Hospital
PO box 719, Al Aroubah Road, Riyadh, Saudi Arabia
Tel: +966 114821234; ext. 3773
Email: [email protected]
Received: June 25, 2015; Accepted: September 15, 2015; Published: September 19, 2015
Citation: Harby MA, Shamrani MA, Edward DP (2015) Measurement of Corneal Diameter Using Smart Phone Technology. J Clin Exp Ophthalmol 6:476. doi:10.4172/2155-9570.1000476
Copyright: © 2015 Harby MA et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Purpose: To compare horizontal white-to-white (WTW) corneal diameter measurements in children with the MultiMeasureTM iPhone application versus a caliper and evaluate the repeatability of MultiMeasureTM. Methods: This prospective, comparative pilot study enrolled 20 children. The horizontal WTW diameter was measured with calipers with the patient in primary gaze (caliper group). Subsequently, corneal photography was performed with the iPhone in primary gaze (primary group) and with a 20° head turn (HT group). MultiMeasureTM was used to measure WTW. To evaluate repeatability of MultiMeasureTM, WTW was measured in 15 children from a clinic while awake (repeatability group) in primary gaze and with a 20° head turn. Three measurements were performed for all patients. Statistical significance was indicated by p<0.05. Results: The mean age of the sedated patients was 8.3 years (range, 2 to 15 years). The mean WTW was 11.68 ± 0.41 mm, 11.85 ± 0.28 mm and 11.34 ± 0.47 mm in the caliper, primary and HT groups respectively. There was a statistically significant difference between measurements in the caliper and HT groups only (p=0.006). Inter-test variability was not statistically significant different (p=0.45 primary group, p=0.37 HT group, p=0.37 caliper group). The mean age of 15 patients in the repeatability group was 7.6 years (range, 3 to 15 years). In the repeatability group, there was a statistically significant mean difference of 0.36 mm between the repeatability group in primary gaze versus head turned (p=0.001). Conclusion: The smart phone application was a fast, convenient, non-contact, repeatable method for measuring the corneal diameter in children in primary gaze.


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