April 2011
Volume 52, Issue 14
Free
ARVO Annual Meeting Abstract  |   April 2011
Agreement Analysis Of Lenstar With Other Techniques Of Biometry
Author Affiliations & Notes
  • Azida J. Kadir
    Ophthalmology, University of Malaya, Kuala Lumpur, Malaysia
  • Jasvinder Singh
    Ophthalmology, University of Malaya, Kuala Lumpur, Malaysia
  • Yen Harn Yew
    Ophthalmology, University of Malaya, Kuala Lumpur, Malaysia
  • John Bell
    Laser Eye Center, Tunbridge Wells, United Kingdom
  • Visvaraja Subrayan
    Ophthalmology, University of Malaya, Kuala Lumpur, Malaysia
  • Voon Pei Loo
    Ophthalmology, University of Malaya, Kuala Lumpur, Malaysia
  • Footnotes
    Commercial Relationships  Azida J. Kadir, None; Jasvinder Singh, None; Yen Harn Yew, None; John Bell, None; Visvaraja Subrayan, None; Voon Pei Loo, None
  • Footnotes
    Support  University of Malaya Research Grant (UMRG)
Investigative Ophthalmology & Visual Science April 2011, Vol.52, 6239. doi:
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    • Get Citation

      Azida J. Kadir, Jasvinder Singh, Yen Harn Yew, John Bell, Visvaraja Subrayan, Voon Pei Loo; Agreement Analysis Of Lenstar With Other Techniques Of Biometry. Invest. Ophthalmol. Vis. Sci. 2011;52(14):6239.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To assess the agreement of the optical low-coherence reflectometry (OLCR) device LENSTAR LS900 with the partial coherence interferometry (PCI) device IOLMaster and the applanation and immersion ultrasound biometry.

Methods: : 76 healthy subjects with phakic eyes were recruited at the Ophthalmology Clinic in University Malaya Medical Center, Kuala Lumpur. Their ocular biometry was assessed using four different methods: LENSTAR, IOLMaster, A-scan applanation and immersion ultrasound biometry. The agreement of mean axial length (AL) and intraocular lens (IOL) power from these four techniques were assessed. The agreement of average keratometry (K) were also compared among the IOLMaster, LENSTAR and TOPCON KR-8100 autorefractor-keratometer. SRK/T formula was used to compute IOL power, with emmetropia as the target refractive outcome.

Results: : LENSTAR-IOLMaster agreement was the strongest in all the variables studied. For these two methods, the proportion of differences was found to be 100% within clinically acceptable ranges (within 0.33mm of AL difference; within 1D of IOL power and average K). There were nontrivial discrepancies between the LENSTAR-IOLMaster comparison group and the LENSTAR-Applanation and LENSTAR-Immersion comparison groups where the proportion of differences were found to be within 0.10mm for AL and within 1D for IOL power. Furthermore, the proportion of differences of average K was 100% within 0.50D in LENSTAR-IOLMaster comparison group but was only 88% in LENSTAR-TOPCON comparison group.

Conclusions: : In normal phakic eyes, AL, average K and IOL power calculated using SRK/T formula from LENSTAR are biometrically equivalent with those from IOLMaster but not with those from applanation and immersion ultrasound biometry.

Keywords: cataract • imaging/image analysis: clinical • imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) 
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