1, This is made from metal frame, so it is very strong and light. And also this is designed to operate easier.
2, This is designed to make a precise subjective measurement with the Test chart, and now it was improved to insert the lens and measure the patient eye easier.
3, It permits to adjust the PD, axis of the lens, length of the frame, position of the nose pad, so you will make a smooth precise measurement.
4,As a maximum 5 pcs. of the lenses will be inserted, so it will permit the smooth and precise reading of the Test chart.