1650, in the Silesian town of Nysa, the remarkable polymath and Jesuit Christopher Scheiner passed away. Renowned as an astronomer, mathematician, and inventor, Scheiners legacy extended into ophthalmology. His contributions ranged from identifying the retina as the locus of light detection, elucidating principles of refraction and aberrations to pioneering observations on corneal curvature and accommodation. Fast forward several centuries on the edges of Silesia, within the confines of a modest perimeter factory, the very first patient- ready Spectral Domain Optical Coherence Tomography (OCT) device in the world emerged, a testament to the ingenuity of Professor Maciej Wojtkowski and the vision of Optopols founder Adam Bogdani. Reflecting on this journey, two decades ago, I penned the inaugural anterior segment and retinal OCT atlas titled Pole to Pole OCT. Initially met with scepticism regarding its transformative potential, I steadfastly believed in the paradigm-shifting capacity of OCT. Subsequent years bore witness to a proliferation of literature made by my department, including books, doctoral theses, and articles, validating my conviction. Today, the landscape of ophthalmology stands irrevocably altered by the ubiquity of OCT technology. Within our department, we have seventeen different OCT devices available, but the two Revo FC 130s stand out among staff due to their efficiency, simplicity, and patient-centric design. Capable of seamlessly integrating corneal topography, pachymetry, and ultra-high-resolution imaging of the anterior segment with that of the retina and optic disc, the Revo epitomizes versatility in ocular imaging. In crafting this atlas, our objective was clear:: to furnish an understanding of Anterior Segment (AS)-OCT and its pivotal role in ophthalmology. Striving to maximize visual comprehension, we prioritized imagery while keeping the text concise. Leveraging the Revo FC 130s unparalleled resolution, we acknowledge the potential challenges posed by slower devices in aching such high-quality images. In the words of astronomer and priest Michał Heller, It is not enough to look; you have to understand what you are looking at. May this atlas serve as a beacon illuminating the depths of AS-OCT understanding, guiding you toward optimal proficiency in your clinic. Adam Wylęgała MD. DM. FEBO. Prof. Edward Wylęgała MD. PhD