Introduction:

To investigate whether the central corneal thickness (CCT), anterior chamber depth (ACD), and keratometric measurements change according to biometric and topographic measurements in childhood and in young adult age.

Methods:

In total, 147 eyes of 78 patients were included in the study. Patients with an ocular disease other than refractive error were not included in the study. CCT, ACD, and keratometry values of all patients were measured with Nidek-AL Scan optical biometry and Sirius combined Scheimpflug-Plasido disc Corneal Topography devices.

Results:

Of the seventy-eight patients, 46 were female and 32 were male. The mean age was 14.46±5.15 years (range, 5-29 years), the mean spherical equivalence was -0.30±1.13 diopters (D), and the mean axial length was 23.28±0.77 mm. The Sirius and AL-Scan CCT were 555.66±39.58 µm and 548.01±38.14 µm, respectively. The Sirius and AL-Scan ACD were 3.65±0.28 mm and 3.57±0.26 mm µm, respectively. The Sirius SimK, AL-Scan K 2.4 mm, and AL-Scan K 3.3 mm values were 43.09±1.45 D, 43.22 ±1.50 D, and 43.2±1.47 D, respectively. The values of CCT and ACD measured on the Sirius device were found to be statistically significantly higher than those measured by the AL-Scan device (p=.00). A high level of correlation was found between the Sirius CCT and the AL-Scan CCT (p=0.000, r=0.974). A high level of correlation was found between the Sirius ACD and AL-Scan ACD (p=0.000, r=0.918). A high level of correlation was found between the the Sirius SimK value and the AL-Scan K 2.4 mm and K 3.3 mm values (p=0.000, r values were 0.979 and 0.982, respectively).

Conclusion:

In childhood and young adult age, between the Sirius and AL-Scan devices, although CCT, ACD, SimK, and 2.4-3.3 mm K were statistically different, a high correlation and agreement were found between the measurements.

Keywords: Biometry, corneal topography, pachymetry, sirius, AL-Scan