Presented by:

Ray T. Oyakawa, M.D.Sharper Vision CentersSharper Vision Centers

A MEDICAL A MEDICAL GROUPGROUP

Comparison of PalmScan and IOL Master axial lengths

measurements

No financial interests

ASCRS Chicago 2008

Study DesignStudy Design

Prospective study for axial length measurement Prospective study for axial length measurement comparison between PalmScan & IOL Master.comparison between PalmScan & IOL Master.

74 consecutive eyes of patients for presbyopia 74 consecutive eyes of patients for presbyopia correcting IOLs between January 19, 2007 & October correcting IOLs between January 19, 2007 & October 17, 2007.17, 2007.

Three eyes were eliminated-could not be measured Three eyes were eliminated-could not be measured with IOL Master V 3.02 software & 5.02 software. One with IOL Master V 3.02 software & 5.02 software. One eye was successfully measured with V. 5.02 when it eye was successfully measured with V. 5.02 when it could not be measured with V 3.02. 47 eyes were done 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.with V 3.02 software and 24 eyes with V 5.02 software.

Patient characteristicsPatient characteristics

36 pts., one unilateral36 pts., one unilateral Average age 68.8, range 50 to Average age 68.8, range 50 to

8484 38 female eyes, 33 male eyes38 female eyes, 33 male eyes 4 Refractive Lens Exchanges4 Refractive Lens Exchanges 67 for presbyopia correcting IOL67 for presbyopia correcting IOL

TechniqueTechnique

IOL Master measurements were IOL Master measurements were taken by two experienced taken by two experienced technicians.technicians.

All immersion measurements All immersion measurements were taken by the author with were taken by the author with the patient in a supine position the patient in a supine position using the Micro Medical using the Micro Medical PalmScan handheld A-scan.PalmScan handheld A-scan.

Eye characteristicsEye characteristics

35 right eyes 36 left eyes35 right eyes 36 left eyes Range 21.38 mm to 28.91 mmRange 21.38 mm to 28.91 mm One psuedophakic eye, 8 post One psuedophakic eye, 8 post

LASIK eyes-3 also post PPVLASIK eyes-3 also post PPV One post PPV w/buckleOne post PPV w/buckle

ResultsResults

Range of axial lengths 21.38 mm to 28.91 mm-Range of axial lengths 21.38 mm to 28.91 mm-IOL MasterIOL Master

Average axial length 24.53 mm –standard Average axial length 24.53 mm –standard deviation 1.82 mm-IOL Masterdeviation 1.82 mm-IOL Master

Average difference in axial length between the Average difference in axial length between the PalmScan and IOL MasterPalmScan and IOL Master

0.022 mm with standard 0.022 mm with standard deviation of 0.10 mm and R coef. deviation of 0.10 mm and R coef. of 0.998of 0.998

4.1 % of eyes could not be measured with the 4.1 % of eyes could not be measured with the IOL Master version 5.02 software.IOL Master version 5.02 software.

ResultsResults

Correlation Coefficient = 0.998Correlation Coefficient = 0.998

ConclusionConclusion

Axial length measurements by the Axial length measurements by the PalmScan immersion ultrasound is PalmScan immersion ultrasound is comparable to the IOL Master and comparable to the IOL Master and can be used when the IOL Master can be used when the IOL Master can not get an axial length can not get an axial length measurement.measurement. Immersion was needed in 4.1% Immersion was needed in 4.1%

(3/74).(3/74). Immersion units are still need Immersion units are still need

even if you have an IOL Master.even if you have an IOL Master.