Design and performance of a real PIAAN optics. Top: curvature radius and sag of both aspheres for a CaF₂ rod design. Bottom, left: star coupling comparing the geometrical model to physical ones. Bottom, right: star coupling in the presence of VLT spiders. Each color curve represents a different lenslet position angle relative to the displayed pupil on the left corner. θ=0^° represents the field position (+37, 0) mas in Fig. 6. Average over all orientations and fibers is shown in gray.