Diplopia is a frequent symptom in ophthalmology and has many causes. It may be binocular or monocular, the latter reflecting ocular damage. The study of the interaction between diplopia and the workstation is often neglected in therapeutic management; however, diplopia at work can have consequences for the health and safety of the worker concerned and therefore for clinical and socio-professional prognosis. We report a case of monocular diplopia due caused by a nuclear cataract in a radiologist. The purpose is to illustrate and explain the interaction between diplopia and work and the repercussions on fitness for work. This case underscores the need for effective, multidisciplinary medical and occupational strategies to manage diplopia in the workplace.