Threshold levels of visual field and acuity loss related to significant decreases in the quality of life and emotional states of patients with retinitis pigmentosa. - Azoulay L; Chaumet-Riffaud P; Jaron S; Roux C; Sancho S; Berdugo N; Audo I; Sahel JA; Mohand-Saïd S (Ophthalmic research, 2015)