Determining a progressive lens optical design

Apparatus for use with a temporary progressive lens configured for temporary use by a subject, based upon an initial progressive-lens optical design, the apparatus comprising:

• a frame in which the temporary progressive lens is configured to be placed, the frame being configured to be worn by the subject and comprising one or more sensors configured to acquire data that are indicative of use of the temporary progressive lens by the subject, while the subject performs activities;
• and
• at least one computer processor configured to:
• receive the data from the sensors;
• based upon the received data, detect when the frame is removed from and/or repositioned on the subject's face;
• in response to detecting instances of the frame having been removed from and/or repositioned on the subject's face, receiving an input from the subject indicating their reasons for the frame having been removed from and/or repositioned on the subject's face;
• based upon the received data, and the reasons provided by the subject for the frame having been removed from and/or repositioned on the subject's face, determine an optimized optical design for a progressive lens for the subject;
• and
• output the optimized optical design.