photoptometer

(fo″top-tom┬┤ә-tәr) an instrument for measuring visual acuity by determining the smallest amount of light that will render an object just visible.
Found on http://www.encyclo.co.uk/local/21001

photoptometer

photoptometer A device for testing the acuity of vision by determining the smallest amount of light that will render an object barely visible.
Found on http://www.wordinfo.info/words/index/info/view_unit/1302/31
No exact match found