VT-100 Supore Auto Phoropter Refractometer is widely used by eye care experts for eye examinations so that they can further recommend the suitable glasses and lenses for the person under treatment. It feature easy one key locking knob which help to prevent un-wanted movement over base during intermittent use. VT-100 Supore Auto Phoropter Refractometer provide a accurate and wide measuring range with its two selected mode ie. Auto and manual mode of measurement.