NDLI: Interocular differences of the Pentacam measurements in normal subjects.

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Interocular differences of the Pentacam measurements in normal subjects.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Falavarjani, Khalil Ghasemi Modarres, Mehdi Joshaghani, Mahmoud Azadi, Pejvak Afshar, Arash Ehteshami Hodjat, Parsa
Spatial Coverage	Iran
Description	Country affiliation: Iran Author Affiliation: Falavarjani KG ( Eye Research Center, Iran University of Medical Sciences, Tehran 14455-364, Iran. drghasemi@yahoo.com)
Abstract	PURPOSE: The aim of this study was to determine the interocular differences of the Pentacam corneal measurements in a normal population. METHODS: A retrospective analysis was performed on 550 eyes of 275 consecutive subjects evaluated for refractive surgery at the Rassoul Akram Hospital, Iran University of Medical Sciences. A Pentacam Scheimpflug camera was used for corneal measurements. Statistical analysis was performed to determine the normal levels of the difference between the two eyes. RESULTS: One hundred and four men and 171 women with a mean age of 29.1 +/- 7.73 years were evaluated. The mean (range) interocular difference was 2.17 (zero to 21) microm for maximum anterior elevation (AEmax), 3.62 (zero to 31) microm for maximum posterior elevation (PEmax), 8.42 (zero to 30) microm for minimum corneal thickness (CTmin), 0.06 (zero to 0.4) mm(3) for three millimetre corneal volume (CV3), 0.19 (zero to 1.2) mm(3) for five millimetre corneal volume (CV5), 0.44 (zero to 2.9) mm(3) for seven millimetre corneal volume (CV7), 0.24 (zero to 2.5) dioptres for the mean keratometry (Km) and 0.39 (zero to 2.5) D for measurements of the corneal dioptric power in the steepest meridian (Kmax). CONCLUSIONS: Individuals with differences greater than 17.4 microm in AEmax, 29.1 microm in PEmax, 29.6 microm in CTmin, 2 D in Km, 2.27 D in Kmax, 0.32 in CV3, 1.05 in CV5, and 2.6 in CV7 between eyes represent less than 0.5 per cent of the population. An interocular difference outside the normal range should alert the clinician to examine for other parameters that are more predictive of post-refractive surgical ectasia.
File Format	HTM / HTML
ISSN	08164622
Issue Number	1
Volume Number	93
e-ISSN	14440938
Journal	Clinical and Experimental Optometry
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2010-01-01
Publisher Place	Australia
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Ophthalmology Cornea Cytology Corneal Topography Instrumentation Adolescent Adult Body Weights And Measures Standards Female Humans Iran Keratoconus Diagnosis Male Middle Aged Photography Methods Reference Values Refractive Surgical Procedures Contraindications Retrospective Studies Sensitivity And Specificity Journal Article
Content Type	Text
Resource Type	Article
Subject	Ophthalmology Optometry

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