To provide a simple measuring apparatus for presbyopia age, which is usable even for a health care of eyes, by allowing a subject to know the presbyopia age of himself from its measuring result, in the portable measuring instrument for examining near visual acuity and adjusting power.

This measuring instrument is portable and holdable by hands, and measures and digitally displays a distance between an eye and a target by opposing a transceiver of an ultrasonic wave and the light to the face, and can display the presbyopia age of the subject from its measuring result, and is constituted so as to be usable as a health barometer of the eye such as daily eyestrain.