SPECIFICATIONS Measurable Range Increments Sphere -19.00 to +16.75 D 0.25 D (being 0.12 D when 0.12 D auxiliary lens is used) Cylinder 0.00 to -6.00 D (being 0 to -8.00 D with Auxiliary lens) 0.25 D (being 0.12 D when 0.12 D Auxiliary lens is used) Axis 0 to 180 o 5o Prism 0 to 20∆ 1∆ Cross cylinder lens ±0.25 D PD measurement 50 to 75 mm (1 mm increments) Convergence ∞ to 380 mm (when PD is 64 mm) Forehead rest adjustment range 16 mm Vertex distance 13.75 mm Dimensions 335 (W) x 320 (D) x 90 (H) mm / 4.5 kg 13.2 (W) x 12.6 (D) x 3.5 (H)” / 9.9 lbs. Standard accessories Near point rod, Near point...