Abstract
The analysis in the impact of transition zone on the optical performance of human eye after laser refractive surgery is important for improving visual correction technology. By designing the ablation profiles of aspheric transition zone and creating the ablation profile for conventional refractive surgery in optical zone, the influence of aspheric transition zone on residual aberrations was studied. The results indicated that the ablation profiles of transition zone had a significant influence on the residual wavefront aberrations. For a hyperopia correction, the profile #9 shows a larger induced coma and spherical aberration when the translation of the centre of pupil remains constant. However, for a myopia astigmatism correction, the induced coma and spherical aberration in profile #1 shows relatively larger RMS values than those in other profiles. Therefore, the residual higher order aberrations may be decreased by optimizing ablation profiles of transition zone, but they cannot be eliminated. In order to achieve the best visual performance, the design of ablation pattern of transition zone played a crucial role.
Highlights
To deliver a conventional correction, it is important to understand the residual wavefront aberrations induced by ablation profiles
Myopia and astigmatism components are generally included in the refractive errors of the human eyes
When the root mean square (RMS) of astigmatism is lower, the ablation profile for pure myopic is usually applied in the conventional refractive surgery
Summary
To deliver a conventional correction, it is important to understand the residual wavefront aberrations induced by ablation profiles. This paper concerns the effect of aspheric transition zone on residual optical aberrations after a conventional corneal ablation. The exact size, shape and the profile of transition zone have profound impact on the residual aberrations. Some researches proved that the aspheric transition zone was safe and predictable [4, 5]. Arbelaez et al reported that a multidynamic aspheric transition zone was included in a laser system in order to minimize the amount of induced aberrations [6]. Our research revealed that the transition zone had a significant impact on residual wavefront aberration [7]. The effect of the ablation profile of transition zone on the residual aberrations deserves further study and research in this theoretical analysis
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