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2: failure of mirror, refracting surface, or lens produce exact point- -point correspondence between object and its image . chromatic aberration. There are numerous higher-order aberrations, of which only spherical aberration, coma and trefoil are of clinical interest.. Spherical aberration is cause of night myopia and is commonly increased after myopic LASIK and surface ablation.. Chromatic aberration occurs when different wavelengths are not focussed same point. Types of chromatic aberration are: Axial (or "longitudinal") chromatic aberration. LASIK generally increases higher order aberrations of eye by inducing irregular astigmatism, which reduces visual quality. LASIK patients may lose contrast sensitivity and see starbursts, glare, halos and multiple images.. This article will help you gain deeper understanding of astronomical eyepiece - its performance parameters, possible optical aberrations and design characteristics.. In article I review one of most common problems affects design of our camera lenses: aberrations. I hope give you practical knowledge about common technical problems of lens design and how they actually affect your photos. Most of all, article is here help you ....