Visual acuity essential for tasks include reading and composing emails, reports, and materials including electronic information and complex materials from either written or computer sources; identifying and organizing library materials such as books, audiobooks, and DVDs based on small-print numbers and alphabetical characters; scanning and inspecting library materials, including opening media cases; and operating computers for extended periods. Typical duties include staffing the library desk, checking out/in materials, issuing library cards, assessing, or adjusting fines, maintaining patron accounts, processing periodicals, processing shipment and book drops, and providing direct assistance to patrons.