First Author: D.Han SINGAPORE
Co Author(s): H. Htoon J. Mehta
Purpose:
To assess the intraobserver and interobserver repeatability of curvature and aberrometric measurements of the corneal surfaces provided by the Visante Omni (Carl Zeiss Meditec).
Setting:
Singapore National Eye Centre
Methods:
Forty right eyes of 40 patients were included in this study. All eyes received a corneal topographic analysis with the Visante Omni system. Three repeated measurements were taken by 2 independent examiners to assess intraobserver and interobserver repeatability for corneal surface measurements. Posterior elevation (4.5mm zone), posterior elevation best-fit sphere (BFS), astigmatism, asphericity (Q) and spherical aberration (SA) were analyzed. Interobserver and intraobserver reproducibility of the above parameters were calculated in terms of limits of agreement (LOA; mean of differences +/- 1.96 x standard deviation of differences). Bland-Altman analysis was also used for assessing interobserver repeatability.
Results:
Mean bias for 2 measurements by the same examiner ranged from -0.002 to 0.015 D for posterior corneal elevation, 0.002 to 0.009 mm for posterior BFS, -0.0002 to 0.02 D for astigmatsim, -0.011 to -0.003 for Q and -0.024 to 0.0002 for SA. There was no difference between the 2 observations (p>0.05). Mean bias for two measurements by two difference observers were -0.02 to 0.005 for posterior corneal elevation, -0.005 to 0.00025 for posterior BFS, -0.516 to -0.334 for astigmatism, -0.154 to -0.073 for Q and -0.291 to -0.036 for SA. There was similarly no difference between 2 observers (p>0.05).
Conclusions:
There was high inter- and intraobserver reproducibility for aberrometric and posterior cornea measurements using the Visante Omni. FINANCIAL DISCLOSURE?: ... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, ... receives nonNomonetary benefits from a company producing, developing or supplying the product or procedure presented., ... receives consulting fees, retainer, or contract payments from a competing company
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