A specific dosage regimen of buprenorphine achieves pain relief from painful episodes due to sickle cell disease. This unit comprises an aberration correcting device comprising a first corrector configured to correct the aberration of the light beam radiated onto the object; and a second corrector configured to correct the aberration of the light beam reflected from the object and to divide the reflected light beam into a plurality of light beams. Only one kind of support base can commonly be used by inserting and removing different probe blocks with respect to the support base and the positional adjustment can be done. Moreover, the inverse characteristic measuring device acquires an inverse characteristic which is a relation of the ideal signal with respect to the output signal.