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

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

Three eyes were eliminated-could not be measured with IOL Three eyes were eliminated-could not be measured with IOL Master V 3.02 software & 5.02 software. One eye was Master V 3.02 software & 5.02 software. One eye was successfully measured with V. 5.02 when it could not be 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 measured with V 3.02. 47 eyes were done with V 3.02 software and 24 eyes with V 5.02 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 84Average age 68.8, range 50 to 84 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 taken IOL Master measurements were taken by two experienced technicians.by two experienced technicians.

All immersion measurements were All immersion measurements were taken by the author with the patient taken by the author with the patient in a supine position using the Micro in a supine position using the Micro Medical PalmScan handheld A-scan.Medical 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 LASIK One psuedophakic eye, 8 post LASIK

eyes-3 also post PPVeyes-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-IOL Range of axial lengths 21.38 mm to 28.91 mm-IOL MasterMaster

Average axial length 24.53 mm –standard deviation Average axial length 24.53 mm –standard deviation 1.82 mm-IOL Master1.82 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 deviation 0.022 mm with standard deviation of 0.10 mm and R coef. of 0.998of 0.10 mm and R coef. of 0.998

4.1 % of eyes could not be measured with the IOL 4.1 % of eyes could not be measured with the IOL Master version 5.02 software.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 can be used when the IOL Master can not get an axial length measurement.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 Immersion units are still need even if you have an IOL Master.you have an IOL Master.