Purpose To study the relationship between visual acuity (VA) and fluctuation of accommodation and aberrometric data in a population of no presbyopic eyes.
Methods Forty‐two no presbyopic eyes with natural pupil and scotopic lighting conditions were involved in the study. Subjects were studied with an autorefractor to determine the refraction and accommodation fluctuations, a ray tracing aberrometer to measure the refraction as well as aberrometric data, and a system to generate charts and determine the subjective refraction and the AV. The equipments were calibrated with an artificial eye before the tests were done. The subjects were divided in several subgroups of 1) subjective refraction (≥|‐0.50|D or <|‐0.50|D); 2) fluctuation of accommodation (≤0.1D or >0.1D) and 3) RMS of different high order (HO) aberrations: 3a) RMS of HO total (≤0.25µm or >0.25µm), 3b) RMS of spherical aberration (≤0.15µm or >0.15µm), 3c) RMS of coma (≤0.15µm or >0.15µm) and 2d) RMS of trefoil (≤0.15µm or >0.15µm)
Results The mean value for VA was 1.28 and 0.16 D for fluctuations of accommodation. No significant differences among fluctuations of accommodation and VA were found in any group. We found normal values about RMS of HO (0.34 μm), RMS of coma (0.19 μm), RMS of trefoil (0.17 μm) and spherical aberration (0.11 μm). No differences between RMS and VA were found in any group. A moderate correlation (R2=0.19) between the VA and the spherical aberration was observed.
Conclusion The values of fluctuation of accommodation and aberrometric data were within normal ranges reported in the literature. Differences between VA and other optical parameters were not found.
Purpose To evaluate the repeatability of Corneal Thickness (CT) measurements and the normal values of Anterior Chamber Volume (ACV), iridocorneal angles and Anterior Chamber Depth (ACD) in healthy human eyes.
Methods Pachymetry and Anterior Chamber (AC) parameters were recorded prospectively in a consecutive case series of 52 normal eyes. All the studied subjects had no ocular abnormalities rather than mild refractive error less than D EE. Measurements were performed using the Galilei Dual Scheimpflug Analyzer.
Results There was a high intra‐observer agreement, finding the best value in the thinnest central CT with an intra‐class correlation coefficient (ICC) of 0.999 and the worst, in the peripheral CT, with an ICC of 0.807. ICC of 0.997 and 0.994 were found in central and paracentral CT respectively. The mean values ± SD for the AC parameters were: ACD 3.29mm ± 0.27mm; ACV 123 mm3 ± 49.05mm3; Temporal Angle ACD 37.58º± 2.83º; Superior Angle ACD 36.71º± 4.05º; Nasal Angle ACD 37.17º± 3.19º and Inferior Angle ACD 38.55º± 3.71º.
Conclusion Galilei device allows a noninvasive measurement of different AC parameters. These data provides benchmark information that can be used to monitor and assess clinical practice; besides pachymetry is found to be a highly repeatable parameter.
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