A-Scan, B-Scan and Pachymeter - Handheld Ophthalmic Biometers

IOL Calculations | PalmScan AP2000 A Scan Print E-mail

Comparison Results

studyresultsgraph77

Avg. Diff. (mm)
0.028
STD (mm)
0.105
Correlation Coeff. (R)
0.998
N
71

In an effort to assess the accuracy of PalmScan AP2000 immersion A-Scan, MMD worked with  Dr. Ray Oyakawa, a leading Ophthalmologist in the southern California area.

Dr. Oyakawa regularly performs both immersion biometry and Laser Interferometry measurements on his patients who undergo cataract extraction surgery with premium IOL implantation. In addition to verifying the Axial Length measurements, Dr. Oyakawa utilizes PalmScan's Anterior Chamber Depth and Lens Thickness measurements to improve the outcome of his premium IOL cases.

The attached table holds comparison biometry data captured by the PalmScan handheld A-Scan (operated in the Immersion mode) and the IOL Master.  The study was carried out on 71 eyes between winter '06 and Winter '08.

The inclusion criteria for these subject eyes were patients with cataracts whom have elected to undergo cataract extraction surgery with premium IOL implant. 

Exclusion criteria were patients with previous ocular surgery.

The range of axial length measurements were between 21.5 mm and 28.9 mm.

The average difference between the two modalities was calculated to be an astounding 0.028 mm (28 microns) with a standard deviation of 0.105 mm.  The correlation coefficient (R) was calculated to be 0.998.

These results show no statistical difference between axial length measurements obtained by PalmScan vs. IOL-Master. Furthermore, the PalmScan provides the additional ability to acquire a much more accurate Anterior Chamber Depth and Lens Thickness measurements than the IOL-Master.

 

View the actual Power Point Presentation of the Study