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Extensive Plus Cylinder Phoropter Range: Built to handle a wide variety of subject prescriptions, the sphere powers range seamlessly from +16.75D down to -19.00D. Professionals can make highly accurate adjustments with minimum readings of 0.25D, which can be further refined to 0.12D when the auxiliary lenses are applied. Accurate Foropter Optometry Phoropter Optometry: It provides precise astigmatism evaluations with a cylinder power range of 0 to -6.00D, extendable to -8.00D using the included auxiliary lens. The astigmatic axis is clearly marked from 0 to 180 degrees, allowing practitioners to make fine 5-degree step adjustments. Professional Optometry Foroptero Build: The instrument features a premium rotary prism capable of 0 to 20ΔD measurements in 1ΔD increments, perfect for detailed visual balance testing. A built-in ±0.25D cross cylinder is synchronized with the astigmatic axis to streamline the examination workflow. Analog Optometry Digital Foroptero Alternative: Delivering unmatched mechanical reliability, it features an interpupillary distance adjustment from 50mm to 80mm with synchronized left and right movement. The convergence mechanism is expertly aligned at 400mm from the corneas to guarantee accurate near-point testing results. Sleek Black Manual Phoropter Construction: Crafted in a stylish black finish, this 5kgs optical unit provides a large 18.5mm effective field of view. It includes a comfortable forehead rest with a 13mm forward and backward adjustment range, ensuring optimal positioning during lengthy vision screenings. ASIN B0H74VY5F6 Item Weight 12.34 pounds Manufacturer AIST OPTICS Package Dimensions 15.55 x 15.15 x 7.67 inches