makes it possible to check whether or not there is a position at which the opening of the landolt ring disappears if there is such a position the user at the user interface unit 1001 clicks at this point with a mouse on the after correction vision test window with the position clicked the electronic service center 1002 identifies the astigmatic axis axis if the same test repeated several times yields a variation the electronic service center 1002 sends to the user interface unit 1001 an after correction vision test window to which a spherical level of magnification sph has been added and repeats the same test if the opening of the landolt ring does not disappear the user at the user interface unit 1001 clicks on u201c the opening does not disappear u201d on the after correction vision test window so that the electronic service center 1002 determines that the user has no astigmatism 2 in addition the electronic service center 1002 transmits a radial index image to the user interface unit 1001 then the user interface unit 1001 allows the user to determine the positions of the most and least dark lines on the after correction vision test window and click the positions with a mouse thereby allowing the electronic service center 1002 to identify the astigmatic axis axis 3 after the astigmatism has been identified a vision test table showing a landolt ring after correcting for the astigmatism is displayed on the window.