Sergio Barbero

Abstract Starbursts are the light-intensity patterns seen when small bright sources are observed at low illumination levels, typically stars at night. Starburst patterns are formed because the eye’s wave aberrations generate caustics at the retina. However, a fascinating yet unexplained fact about starbursts is that they usually exhibit p-fold symmetry. Moreover, the number of peaks, related to the symmetry perceived by the subject, is not always the same.

Abstract Multifocal lenses comprising progressive power surfaces are commonly used in contact and intraocular lens designs. Given a visual performance metric, a wavefront engineering approach to design such lenses is based on searching for the optimal wavefront at the exit pupil of the eye. Multifocal wavefronts distribute the energy along the different foci thanks to having a varying mean curvature.

A la izquierda, una imagen como vería un ojo sin defectos visuales. A la derecha, una simulación de como vería esa misma imagen alguien con astigmatismo.Nancy Zambrano Si le dijésemos a un oftalmólogo, no especialista en óptica, que la geometría diferencial ha sido crucial para entender la formación de imágenes en el ojo humano, quizá nos mirase con expresión incrédula.