HOYA isert 351 toric

Transcription

1 HOYA isert 351 toric

2 Patient selection Suitable patient: ametropia with corneal astigmatism > 1.0 D regular astigmatism stable cornea wish for glasses independence / realistic expectations and motivation Unsuitable patient: pre existing congential eye abnormality or disease which affect visual acuity (e.g.. trauma, AMD /CNV, uveitis, diabetic retinopathy) Keratoconus / Irregular astigmatism corneal sutures / Instable cornea 2

3 isert Injector description HOYA isert351 Case cover Case Plunger Slider Handling tab Body Release tabs OVD infusion port

4 Descprition isert 351 toric Technical details: Name: 351Tx Optic material: Hydrophobic acrylic Haptic material: Hydrophobic acrylic with PMMA haptic tips Haptic configuration: C-loop Optic design: Aspheric ABC anterior Toric design posterior Total size: 12.5 mm Optic size: 6.0 mm Power: D to D cyl: T3 to T9 (+1.5 D to +6.0 D on IOL plane) A-Constant: Filter: UV-Filter and bluelightfilter Incision: 2.2 mm Injector: isert toric (preloaded)

5 Technical details The different cylinder power available Type / Name IOL Cylindrical Power Cylinder at the corneal plane Target patient 351 T D 1.03 D 0.75 to 1.5 D 351 T D 1.55 D 1.5 to 2.0 D 351 T D 2.06 D 2.0 to 2.5 D With this three different power distribution we can cover around 90 % of all corneal cylinder Data from post-marketing survey of HOYA AF-1 39,55% 17,56% 22,66% 10,84% 9,39% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% < ~ ~ ~2.0 >2.0 Reference: HOYA Research Center 5

6 Descprition isert 351 toric Type / Name IOL Cylindrical Power Cylinder at the corneal plane Recommended corneal astigmatism correction 351 T D 1.03 D 0.75 to 1.5 D 351 T D 1.55 D 1.5 to 2.0 D 351 T D 2.06 D 2.0 to 2.5 D 351 T D 2.58 D 2.5 to 3.0 D 351 T D 3.09 D 3.0 to 3.5 D 351 T D 3.61 D 3.5 to 4.0 D 351 T D 4.12 D 4.0 D and up

7 IOL marks Posterior Surface Steep Meridian Flat Meridian 2 axis markings near each hapticroot (total markings 4) Axis markings are on the flat meridian with orthogonal steep meridian Axis Markings (total markings 4) The mean of the refractive power of flat and steep meridian is defined as the spherical power, and the difference as the cylinder power.

8 Technical details - Influence of different thickness- Design in which edge thickness changes to round the optic body Edge thickness is maximum on flat meridian, gradually thins, and minimum on steep meridian Circular optic body Minimum Edge Thickness Maximum Edge Thickness

9 IOL rotation - Effect of rotation by different power - Rotation Cylinder 1.50 D Cylinder 2.25 D Cylinder 3.0 D Rotation by a high power cylinder has a bigger impact as a low power cylinder! 9

10 IOL rotation Theoretical effects of axis misalignement on astigmatism correction: 4 14% under correction of astigmatism 6 20% under correction of astigmatism 8 25% under correction of astigmatism 16 50% under correction of astigmatism >30 = no benefit of the toric lens Toric Effectiveness (%) Rotation Angle (Degree) 10

11 Procedure 1. Measuring of the cornea 2. Calculation of the IOL and localisation of axis placement 3. Marking of the axis 4. On-axis placement of the IOL into the capsular bag (1.) (2.) (3.) (4.)

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16 HOYA itrace Surgical Workstation Select the best IOL style and model for each patient with precise pre-operative metrics from this 5-in-1 Raytracing system: auto-refractor aberrometer corneal topographer auto-keratometer pupillometer (additional Toric Planer for the correct toric IOL and IOL axis placement)

17 Singularly Focused Globally Powered

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