Disclosed herein are a user device and a computer program stored in a computer-readable medium for controlling display. The user device includes a computer program stored in a computer-readable storage medium, and the computer program is executable by at least one processor and includes instructions adapted to cause the at least one processor to perform operations. The operations include the operations of: M acquiring eye examination information of a user； determining display optimization information for the user at least partially based on user information including the eye examination information； and determining to adjust display settings of at least one user-related user device at least partially based on the determined display optimization information.
