A auto lensmeter or lensometer, also known as a focimeter, dioptrimeter is an ophthalmic instrument.
Sphere：0 to ±35D（0.01D/0.06D/0.12D/0.25D steps)
Cylinder: 0 to ±10D（0.01D/0.06D/0.12D/0.25D steps)
Axis: 0°to 180°（1°step)
ADD: 0 to 10D（0.01D/0.06D/0.12D/0.25D steps)
Prism: 0 to 15△(0.01△)
Cylinder mode: +, +/-, –
X-Y: cartesian coordinates H:I,O; V:U,D.
P-B: polar coordinates
mm: mm expression
Reading resolving power： 0.01D,0.06D,0.12D,0.25D
Measure single vision lens,bifocal lens,trifocal lens and progressive lens,etc