TY - BOOK TI - Subjective refraction and prescribing glasses: the number one (or number two) guide to practical techniques and principles AU - Kolker, Richard J. AU - Kolker, Andrew F. PB - SLACK Incorporated PY - 2018 PY - © 2018 CY - Thorofare, NJ SN - 1630915599 SN - 9781630915599 U3 - 9930833884404761 ET - Third edition ER -