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Emilia Cantera, Magdalena Cortes, Roberto Sacco, Alessandra Micera; Topographic Indices and Pachimetry in healthy adolescents obtained with Sirius topographer. Invest. Ophthalmol. Vis. Sci. 2017;58(8):3547.
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© ARVO (1962-2015); The Authors (2016-present)
to determine the normal values of some topographic indices and Corneal Pachimetry, in a healthy adolescent population through the Sirius Corneal Topography
274 students (144 F/ 130 M; range 12 to 14 years, mean age 12,95 ± 0,82 years) from the Hebrew School of Rome participated to this cross sectional and observational study. Right eyes were imaged through Sirius Corneal topographer. Values were obtained from average of three high quality acquisitions. Corneal anterior and posterior curvatures (Anterior meridian Average and Posterior Meridian Average), Mean Pupillary Power (MPP), Central Corneal Thickness (CCT), Minimum Corneal Thickness (MinThick), and anterior and posterior asymmetry indices (SIf and SIb respectevily) were acquired. Correlations between corneal parameters (Pearson correlation) and differences between anterior and posterior corneal surface (student t test) were analyzed.
Anterior Meridian Average was 7.79 ± 0.26; Posterior Meridian Average was 6.50 ± 0.26 mm; CCT was 550,80 ± 29.88 mm, MinThick was 547,36 micron ± 29,94, MPP was 42,95 D ± 1,46, SIf was -0,035 ± 0,46, and SIb was 0,012 ± 0,91. Corneal curvatures (anterior and posterior) correlated negatively with MPP (r=-0,99; p=0,000 and r=-0,85 p=0.000 respectively). Anterior curvature correlated positively with posterior curvature (r=0,891 ; p=0,000). No correlations were found between corneal curvatures and asymmetry indices (SIf, SIb) or corneal pachimetry. Positive correlations were found for SIf and SIb (r=0,58 ; p=0,000). Negative correlations were found for SIf and corneal pachimetry (r= -0,23 ; p=0,000) and for SIb and corneal pachimetry (r=-0,19; p=0,012). The difference between anterior meridian and posterior meridian was 1,29 ± 0,12, and was significative (p<0,001). No difference between genders or correlation with age were found.
These results supply normal standards for corneal topographic values in adolescents and could be useful for future comparative studies of corneal diseases in the 12-14 age group population
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
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