The Burton BR8500 is designed for a relaxed refraction process. Spherical power ranges from -19.00D to +16.75D in 0.25D steps (-29.00DS to +26.75DS and ±0.12D steps with auxiliary lens). Cylindrical power ranges from 0 to -6.00D in 0.25D steps (0 to -8.00D with auxiliary lens). All the lenses are coated in high-grade plated film to eliminate any glare or ghost images. Precision excellence in refraction Cross cylinder and rotary prism Employs a state-of-the-art convergence system Greater testing range with the use of auxiliary lenses Free spinning bearings provide greater precision and durability Visual functions area available (binocular vision, stereopsis)
Spherical Lens: -19.00DS to +16.75DS in 0.25D steps (0.12D steps with auxiliary lens) Cylindrical Lens: 0 to -6.00D in 0.25 D steps (0 to -8.00D and in 0.12D steps with auxiliary lens Axis of Cylindrical Lens: 5° steps Cross Cylindrical Lens: ±0.25D Rotary Prism: Range of measurement 0, -20Δ, Step 1Δ Pupil Distance: Range 50mm ~ 75mm, Step 1mm Aggregated Adjustment: 00, 380mm Adjustment of Forehead Rest: 16mm Vertex Distance: 13.75mm Overall Dimensions: 335mm (L), 320mm (W), 90mm (H) Weight: 5kg / 11 lb.