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

2. Study Design Prospective study for axial length measurement comparison between PalmScan & IOL Master. 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. 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. 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 36 pts., one unilateral Average age 68.8, range 50 to 84 Average age 68.8, range 50 to 84 38 female eyes, 33 male eyes 38 female eyes, 33 male eyes 4 Refractive Lens Exchanges 4 Refractive Lens Exchanges 67 for presbyopia correcting IOL 67 for presbyopia correcting IOL

4. Technique IOL Master measurements were taken by two experienced technicians. 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. 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 35 right eyes 36 left eyes Range 21.38 mm to 28.91 mm Range 21.38 mm to 28.91 mm One psuedophakic eye, 8 post LASIK eyes-3 also post PPV One psuedophakic eye, 8 post LASIK eyes-3 also post PPV One post PPV w/buckle One post PPV w/buckle

6. Results Range of axial lengths 21.38 mm to 28.91 mm-IOL Master 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 axial length 24.53 mm –standard deviation 1.82 mm-IOL Master Average difference in axial length between the PalmScan and 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 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. 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. 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 was needed in 4.1% (3/74). Immersion units are still need even if you have an IOL Master. Immersion units are still need even if you have an IOL Master.