Visual ability to see details at a distance (corrected to 20/40), to see details of objects at a close range (within a few feet of the observer), to match or detect differences between colors, including shades of color and brightness and to judge which of several objects is closer or farther away from the observer, or to judge the distance between an object and the observer. The CT Technologist performs computed tomography (CT), general radiology, and fluoroscopy, including portable procedures, to produce cross-section images of patients internal organs and tissues for diagnosis of medical issues, as ordered by physicians.