Hands-on labs · ABO
Measuring tools
Hands-on practice for the ABO dispensing and instrument skills. Every problem is new, and your scores are saved on this device.
- ABO
Frame measurement
Caliper a frame for A, B, DBL and ED, then work out frame PD, decentration and minimum blank size.
Measure a frame - ABO
Lens clock
Read a Geneva lens measure on both surfaces of a hidden lens and derive its power, base curve and cylinder.
Use the lens clock - ABO
Progressive markings
Find the hidden engravings, rebuild the fitting cross and prism reference point, read the add and the fitting height.
Re-mark a progressive