Prism Therapy and Surgical Correction for a Case of so-colled Phoria-Myopia Makiko KINJO, Kazuyo NAKAMURA, Tamako NAGAO, Satoshi NIKI, Mariko TAWARAYA, Seiichi TSUCHIYA and Sumu SOSHI Department of Opthalmology Tokai University School of Medicine A case of gphoria-myopia h was presented in this report. He was 29 years old who had astenopie complaints for 2 years. Visual acuity was decreased in binocular vision compared with in monocular vision. Excessive accomodative convergence (2.5D) in compensation for intermitted extropia (40-46 ) was revealed. Prism therapy was not effective, while surgical therapy was successful. Excessive accomodation and astenopia were disappeared after the correction of exodeviation. The condition of pre-and post surgery was compared regarding the following items: in accomodation, pupil size, binocular vision and binocular function. The relation between the accomodation and the angle of deviation in cases of Phoria-Myopia presented recentry was discussed.