Ray T' Oyakawa, M'D'

1
Comparison of PalmScan and IOL Master axial
lengths measurements
Presented by Ray T. Oyakawa, M.D.
Sharper Vision Centers
A MEDICAL GROUP
ASCRS Chicago 2008
No financial interests
2
Study Design

• Prospective study for axial length measurement
  comparison between PalmScan IOL Master.
• 74 consecutive eyes of patients for presbyopia
  correcting IOLs between January 19, 2007
  October 17, 2007.
• Three eyes were eliminated-could not be measured
  with IOL Master V 3.02 software 5.02 software.
  One eye was successfully measured with V. 5.02
  when it could not be measured with V 3.02. 47
  eyes were done with V 3.02 software and 24 eyes
  with V 5.02 software.

3
Patient characteristics

• 36 pts., one unilateral
• Average age 68.8, range 50 to 84
• 38 female eyes, 33 male eyes
• 4 Refractive Lens Exchanges
• 67 for presbyopia correcting IOL

4
Technique

• IOL Master measurements were taken by two
  experienced technicians.
• All immersion measurements were taken by the
  author with the patient in a supine position
  using the Micro Medical PalmScan handheld A-scan.

5
Eye characteristics

• 35 right eyes 36 left eyes
• Range 21.38 mm to 28.91 mm
• One psuedophakic eye, 8 post LASIK eyes-3 also
  post PPV
• One post PPV w/buckle

6
Results

• Range of axial lengths 21.38 mm to 28.91 mm-IOL
  Master
• Average axial length 24.53 mm standard deviation
  1.82 mm-IOL Master
• Average difference in axial length between the
  PalmScan and IOL Master
• 0.022 mm with standard deviation of 0.10 mm and R
  coef. of 0.998
• 4.1 of eyes could not be measured with the IOL
  Master version 5.02 software.

7
Results

• Correlation Coefficient 0.998

8
Conclusion

• Axial length measurements by the PalmScan
  immersion ultrasound is comparable to the IOL
  Master and can be used when the IOL Master can
  not get an axial length measurement.
• Immersion was needed in 4.1 (3/74).
• Immersion units are still need even if you have
  an IOL Master.