Desription:
This product is used to detect ocular ametropia and visual function. This product is mainly composed of the inspection disc, the adjusting part, the lens, the measuring scale and so on. The inspection disc is composed of a built-in multi disk mechanism consisting of a ball lens, a column lens, and a lens.

Specifications:
Sphere degree range：0D-16.75D, increment 0.25D, -19.00-0D increment 0.25D
Cylinder degree range：-0.25D to-6.00D, with minimum reading 0.25D
Astigmatic axis scale：0 to 180° in 5° step
Cross cylinder：±0.25D，also can choose ±0.5D reversal type (synchronized with astigmatic axis)
P.D. adjustment：50-80mm
Fixed-point distance adjustment range：0-13mm
Effective field of view：19mm
Weight：5kg