How to use the ruler mode?
➢ Mark on the lenses the position of the optical centers (or of the pupils if there is a shift).
➢ Place horizontally the spectacles on the screen using the border of the screen.
➢ Center the spectacles using the nose indication (14).
➢ Align the left cursor on the mark of the left lens using the buttons (1&2&3&4).
➢ Align the right cursor on the mark of the right lens using the buttons (7&8&9&10).
➢ If the border of the spectacles is thick, move up the cursors and rules using (5) button.
➢ Read the PD (11) and height (12).