CNGA3 and achromatopsia: <h4>Purpose</h4>The purpose of this study was to assess the natural history of the foveal cone mosaic in CNGA3-associated achromatopsia (ACHM).<h4>Methods</h4>Thirteen eyes from 10 genetically confirmed patients underwent longitudinal imaging with optical coherence tomography (OCT) and non-confocal split detection adaptive optics scanning light ophthalmoscopy (AOSLO).