Comparison of Clarus and Optomap Ultra-Widefield Imaging Systems before and after EVO-ICL Implantation in High Myopia

Abstract

<b><i>Introduction:</i></b> The aim of this study was to investigate the features of imaging differences between Clarus and Optomap ultra-widefield imaging systems after implantable collamer lens (ICL) implantation. <b><i>Methods:</i></b> This was a non-randomized controlled study. Ninety-two eyes of 46 consecutive patients were enrolled. Full-scale ophthalmological examinations were conducted preoperatively. All patients underwent Clarus (CLARUS 500; Carl Zeiss, Dublin, USA) and Optomap (Daytona; Optos, UK) ultra-wide imaging sequentially under the same circumstance preoperatively and 1 month after EVO-ICL implantation. A single image was acquired from each. D_x was defined as the distance between the upper furcation of the central retinal artery and the central fovea of macula. Pixels of the optic cup and disc and D_x as well as the optic cup/disc ratio were calculated and compared on each machine before and after surgery. <b><i>Results:</i></b> All surgeries were uneventful without complications. Safety and efficacy indices were both 100% at 1 month. Values of both optic cup and disc areas were in decrease after surgery with statistically significant differences (<i>p</i> &lt; 0.001), while the cup/disc ratio remained the same (Clarus mean of differences = −0.0028, <i>p</i> = 0.83; Optomap mean of differences = −0.0016, <i>p</i> = 0.76). D_x of images captured with either machine was statistically significantly decreased (<i>p</i> &lt; 0.001). Differences of both optic cup (<i>p</i> = 0.057) and disc (<i>p</i> = 0.041) areas of Clarus were more obvious than that of Optomap, while only the latter was with statistical significance. Difference of D_x of Clarus was statistically significantly larger than Optomap. <b><i>Conclusions:</i></b> Display ranges tend to be broadened after EVO-ICL implantation in both Clarus and Optomap ultra-widefield imaging systems, while Clarus shows a wider display range of the two, which encourages the application of Clarus when it comes to the detection of more peripheral retinal lesions.