Using the ASCRS Post-Refractive Surgery IOL Calculator: A Retrospective Review - PowerPoint PPT Presentation

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Using the ASCRS Post-Refractive Surgery IOL Calculator: A Retrospective Review

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Using the ASCRS Post-Refractive Surgery IOL Calculator: A Retrospective Review Amit Patel MRCOphth, Achyut Mukherjee MRCOphth, Vinod Kumar FRCSEd(Ophth) – PowerPoint PPT presentation

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Title: Using the ASCRS Post-Refractive Surgery IOL Calculator: A Retrospective Review


1
Using the ASCRS Post-Refractive Surgery IOL
Calculator A Retrospective Review
  • Amit Patel MRCOphth, Achyut Mukherjee MRCOphth,
    Vinod Kumar FRCSEd(Ophth)
  • Princess of Wales Hospital, Bridgend, UK

The authors have no financial interests with
regards to this poster
2
Purpose
  • Assess the value of the ASCRS post-refractive
    surgery IOL calculator (http//iol.ascrs.org/) in
    cases where the IOL power was chosen prior to the
    availability of the calculator

3
Methods (1)
  • 10 eyes of 8 patients were identified from
    theatre records
  • A retrospective case note review was carried out
  • Pre- post-refractive and cataract surgery data
    was noted

4
Methods (2)
  • Data available at the time of cataract surgery
    was entered into the ASCRS calculator
  • The average IOL power and applicable formulae
    generated by the calculator were noted
  • The chosen IOL power was compared to the average
    IOL power generated by the calculator
  • The various applicable formulae were analysed to
    determine which formula would have given the most
    accurate refractive outcome

5
Results (1)
  • 3 patients (4 eyes) had incomplete pre-refractive
    surgery data
  • 2 patients (3 eyes) had no pre-operative data
  • 1 patient (1 eye) had no post-operative
    refractive data

6
Results (2)
  • 9 eyes (90) were within 1D of the refractive aim
  • The predicted refractive outcome with use of the
    average IOL power suggested by the ASCRS
    calculator would have
  • Improved in 5 eyes (50) worsened in 5 eyes
    (50) Graph 1
  • Resulted in 9 eyes (90) of eyes to be within 1D
    of refractive aim

7
Post-operative refractive outcomesChosen IOL vs
Average ASCRS IOL
Refractive error (SE)
8
Results (3)
  • Of the potential 13 formulae available, an
    average of 4 formulae per eye were available for
    use with the given data

Graph 2
9
Conclusion (1)
  • The number of available formulae is a testament
    to the difficulty in IOL calculation in eyes that
    have previously undergone refractive surgery
  • In this case series, the Shammas method appeared
    most accurate however there may be a bias as
    this was the only applicable formula in 4 eyes
    (those with incomplete/absent pre-operative data)
  • The lack of available data restricted the number
    of formulae that could be applied (average of 4
    formulae)

10
Conclusion (2)
  • Using the average calculated IOL from the ASCRS
    calculator did not significantly alter the
    refractive outcome
  • The calculator was however useful in collating
    all the available data and presenting the various
    applicable formulae to the surgeon
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