Specifications:
Type: external reading system
Eyepiece focusing: 0-±5D
Vertex power: range: 0-±25D, 0.125D steps up to ±5D, 0.25D steps beyond ±5D
Cylinder axis: 0-180°, 1° steps
Prism power: 0-5Δ(RS6006-I: 0-20Δ with prism compensator), 1Δ steps
Prism base direction: 0-360°, 1° steps(0-180°), 5° steps(180-360°)
Lens diameter: 16-80mm
