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I have no financial interest in any devices or techniques discussed in this presentation

I have no financial interest in any devices or techniques discussed in this presentation. Rotation of Hydrophobic Acrylic Toric IOL. Jonathan M. Davidorf, M.D. Los Angeles, CA April, 2010. Case Report. Initial Evaluation. 59 y.o. myopic male presents with decreased vision OS

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  1. I have no financial interest in any devices or techniques discussed in this presentation

  2. Rotation of Hydrophobic Acrylic Toric IOL Jonathan M. Davidorf, M.D. Los Angeles, CA April, 2010

  3. Case Report

  4. Initial Evaluation • 59 y.o. myopic male presents with decreased vision OS • Wears spherical soft CLs • Current Spectacles (several yrs old)OD: -5.50+0.25x168 = 20/60OS: -6.50+0.25x163 = 20/60 • MROD: -7.50+0.50x170 = 20/25+OS: -10.75+0.50x025 = 20/40--

  5. Initial Evaluation • 1+ nuclear sclerosis OD2+ nuclear sclerosis OS • PVD OS, no retinal pathology OU • Patient desires cataract surgery OS only (despite anisometropia), will wear conact lens OD postoperatively until cataract OD progresses

  6. Keratometry (OS) Figure 1

  7. IOL Selection (OS) • Patient does not mind wearing reading glasses (presbyopic IOLs discussed) • Prefers minimizing spectacle/contact lens dependence for distance vision • Vector analysis using the AcrSofR Toric IOL Calculator predicted residual astigmatism of 0.51D at 099 degrees using a spherical IOL (Figure 2) (http://www.acrysoftoriccalculator.com)

  8. Figure 2

  9. Perioperative Course (OS) • Standard clear corneal incision (2.4 mm), topical, phacoemulsification performed • 12.5D Aspheric hydrophobic acrylic IOL (AcrySofR SN60WF) implanted • Vsc postoperative day 1 = 20/25 • Developed significant posterior capsular opacification, underwent YAG PC • 7 months Postop MR: 0.25+0.25x027= 20/20

  10. Follow-up Evaluation • Patient now has complaints of decreased vision OD • Corrected distance vision 20/50 OD • 2+ NS, 1+PSC OD • Patient desires cataract surgery OD

  11. Keratometry (OD) Figure 3

  12. IOL Selection (OD) • Patient still does not mind wearing reading glasses (presbyopic IOLs discussed) • Still prefers minimizing spectacle/contact lens dependence for distance vision • Vector analysis using the AcrSofR Toric IOL Calculator predicted residual astigmatism of 0.39D at 109 degrees using the lowest power toric IOL (Figure 4) (http://www.acrysoftoriccalculator.com)

  13. Figure 4

  14. Operative Course (OD) • Coaxial phacoemulsification (2.4mm CCI) • 12.0D hydrophobic acrylic toric IOL (AcrSofR SN60T3) in the 109o meridian (figure 5).

  15. Good IOL alignment at the end of the procedure. Gentian violet mark is at approximately 105 degrees. Figure 5

  16. Postoperative Course (OD) • POD 1 Vsc 20/200 ODMR: -1.50+1.00x107 = 20/30 • Toric IOL aligned at 47o (45o from intraoperative placement; figure 6) • POD 7Vsc 20/40 ODMR: -0.75+1.00x120 = 20/25+ • Vision has been stable, patient very happy and desires no further intervention (ie: IOL rotation)

  17. Figure 6 In image at left, the toric IOL is seen aligned at approximately 47o With patient looking up and left (right image), the toric markings are easily seen.

  18. Discussion • While the hydrophobic acrylic toric IOL (AcrySofR Toric IOL) has good documented rotational stability (1), significant rotation can occur. • Evaluation of the surgical video demonstrates absence of deliberate viscoelastic removal from behind IOL optic. • Subsequent to this case, we now deliberately remove viscoelastic from behind the toric IOL optic and have had no significant IOL rotations identified (60 subsequent toric IOLs implanted) • It is estimated that each degree of rotation confers a 3.3% loss of effect, so that with a 30 degree rotation, the toric IOL has no effect (2). Inasmuch as a 90 degree IOL rotation confers a 100% induction of cylinder along the preoperative meridian, it can be expected that there is essentially no toric effect for rotations between 30 and 60 degrees. The 45 degree rotation identified in our case with a subsequent residual refractive astigmatism of 1.00D supports this theory. • Objectively, the results in this case with a residual astigmatic refractive error of 1D fell short of our expectations. • Subjectively, the patient tolerated the residual astigmatism well.

  19. Conclusions • While uncommon, hydrophobic acrylic IOLs can rotate significantly within the first 24 hours of surgery. • Consider deliberately removing viscoelastic from behind the toric IOL optic to minimize rotational instability. • For better or worse, a patient’s subjective assessment trumps objective findings in determining the patient’s level of happiness following eye surgery.

  20. References • Mendicute J, Irigoyen C, Aramberri J, Ondarra A, Monte´s-Mico´ R. Foldable toric intraocular lens for astigmatism correction in cataract patients. J Cataract Refract Surg 2008; 34:601–607 • Novis C. Astigmatism and toric intraocular lenses. Curr Opin Ophthalmol 2000; 11:47–50

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