Plastic 1.5 Double-D Occupational LensesPlastic 1. 5 Double D Occupational Lenses are designed to provide enhanced vision for individuals who need to perform near and intermediate tasks with greater clarity and comfort. The Double D design offers a dual vision system, making it a great solution for people who engage in occupational activities that require both near and intermediate vision correction, such as desk work, computer tasks, or detailed hands on tasks.