The repeatability and reproducibility of four techniques for measuring horizontal heterophoria: Implications for clinical practice Nicola S. Anstice; Bianca Davidson; Bridget Field; Joyce Mathan; Andrew V. Collins; Joanna M. Black;

Convergence insufficiency: Review of clinical diagnostic signs Liat Gantz; Hadas Stiebel-Kalish;

Measurement of visual acuity with a digital eye chart: optotypes, presentation modalities and repeatability Giada Campo Dall¿Orto; Alessio Facchin; Alessia Bellatorre; Silvio Maffioletti; Marina Serio;