원,근거리 사위에 따른 노안 가입도 연구

Purpose: This study is to investigate correlation between diatance·near phoria and near addition for presbyopia. Methods: 60 subjects, who have no ocular disease and over 0.8 of corrected visual acuity, participated for this study. The mean age of subjects was 51.88±10.50 years(40 to 76 years). Howell distance phoria card for 3m and Howell-Kim near phoria card for 40cm were used for distance and near phoria measuremets respectively. Additions were measured by using a cross grid visual chart for 40cm with ±0.50D Jackson cross cylinder in an auto-phoroper. Results: For correlation distance phoria and age, the increaser age was the higher exophoria or the lower esophoria (r=0.40, p