One form of evaluation apparatus comprising a plurality of light sources vertically arranged by one side of a carrier line in width direction Y perpendicular to carrying direction X of the carrier line; and a light-receiving section arranged by an opposite side of the carrier line in the width direction Y perpendicular to the carrying direction X of the carrier line. A second programming is included for programming a notification date for notifying a user that the event must be performed. Additionally, it is preferable that the amount of force that is required in order to trigger an alarm be adjustable to accommodate patients of different weights. A refractive index in whole of the horizontal refractive index distribution curve W continuously varies. Further, in at least either of the first gear portion and the second gear portion, an axial length of a part of gear teeth constituting the gear portion is different from axial lengths of other teeth.