01. AFANADOR A.J., AITSEBAOMO P., GERTSMAN D.R: Eye and head contribution to gaze at near through multifocals: the usable field of view. American journal of optometry and physiological optics 63 (3) S. 187 - 192 (1986)

01. AFANADOR A.J., AITSEBAOMO P., GERTSMAN D.R: Eye and head contribution to gaze at near through multifocals: the usable field of view. American journal of optometry and physiological optics 63 (3) S. 187 - 192 (1986)