Purpose. To evaluate to which extent individual Zernike terms can be corrected. Methods. Ablation time and fidelity was analysed\nusing different fluence levels (range 90ââ?¬â??2000 mJ/cm2) and aspheric ablation profiles.With optimal parameters, the extent to which\nindividual Zernike modes can be corrected was evaluated. Results. The range 188ââ?¬â??565 mJ/cm2 resulted as optimum fluence level\nwith an optimum proportion range 50%ââ?¬â??90% for high fluence. With optimal parameters, it corresponds to 2.4 s/D at 6mm OZ,\nwith fidelity variance of 53 ?m RMS, and average ablation error of 0.5 ?m for each location. Ablation simulation of coma Z[3,Ã?±1]\nshowed 98,4% accuracy and 98% fit quality; trefoil Z[3,Ã?±3], 99,9% accuracy and 98% fit quality; spherical aberration Z[4,0],\n96,6% accuracy and 97% fit quality; secondary astigmatism Z[4,Ã?±2], 97,9% accuracy and 98% fit quality. Real ablation on a flat\nplate of PMMA of coma Z[3,Ã?±1] showed 96,7% accuracy and 96% fit quality; trefoil Z[3,Ã?±3], 97,1% accuracy and 96% fit quality;\nspherical aberration Z[4,0], with 93,9% accuracy and 90% fit quality; secondary astigmatism Z[4,Ã?±2], with 96,0% accuracy and\n96% fit quality. Conclusions. Ablation of aspherical and customised shapes based upon Zernike polynomials up to the the 8th order\nseems accurate using the dual fluence concept implemented at the AMARIS platform.
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