It is used to measure the curvature and reflection of the anterior surface of the cornea.

Specifications:
Size of Measuring Targets: 18 x 24mm
Distance between measuring targets and cornea: 175mm
Radius of curvature: 5.5~11mm
Refractive power: 30~60dpt
Refractive index based on the diopter calculation: 1.3375
Scale protractor: - Field: 0° ~ 180° - Graduation: 5°
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Model: HR-20.38