... . B, B+B, B+A, A features 3. Zoom from 34mm~60mm A/B Scan(A scan,B scan),Optical instrument About RS8229-I A/B Scan, A scan,B scan Description1 . Higher resolution2. B, B+B, B+A, A ... thickness(immersion mode), Anterior chamber depth, lens thichness, Vitreous length and axial lengthMeasuring mode: Auto(for normal, aphakic, spcial, dense cataract ...