VisTor The new Toric IOL by Hanita Lenses Sept 2013
Definition Astigmatism - The cornea has different radii (Dpt) in different meridians, causing the focus to spread between two points.
Effect on vision The image may be clearly focused on the retina in the horizontal plane, but not in the vertical plane: Or vice-versa: Or at any other angle…
Diagnosis: Regular astigmatism IOLMaster Topographer
Diagnosis: Irregular Astigmatism IOLMaster Topographer
Correction of astigmatism by IOL Astigmatic cornea can be represented as cylinder, causing vertical rays focus differently from horizontal ones, leading to dispersion of focus and blurry image quality. This can be corrected by placing additional cylinder of the same power, rotated by 900. This is the principle of action of the toric IOL. The IOL corrects the dispersion induced by the cornea, focusing the rays in one point on the retina and restoring the sharp image quality.
Correction of astigmatism by IOL Astigmatic cornea can be represented as cylinder, causing vertical rays focus differently from horizontal ones, leading to dispersion of focus and blurry image quality. This can be corrected by placing additional cylinder of the same power, rotated by 900. This is the principle of action of the toric IOL. The IOL corrects the dispersion induced by the cornea, focusing the rays in one point on the retina and restoring the sharp image quality.
VisTor Platform Excellent stability in the capsular bag endurance to rotation, tilt & decentration. Visible axis marking even for small pupils Injection through 1.8 mm incision 3600 enhanced square edge decrease PCO
Aspheric optics Anterior toric surface, posterior aspheric surface Designed using Arizona Uni. model, with statistical eye data of old population Standard corneal spherical aberration +0.27µ, corrected by natural lens IOL asphericity -0.14, leaving residual +0.13µ for better contrast sensitivity, shown in Prof. Tetz study Total correction of Toric aberrations
Raw material Hydrophilic acrylic 25% water, produced by Benz R&D (USA) >10 years clinical experience and > 1 million implantations of Hanita’s IOLs Violet light blocker equivalent to natural chromophore. Better transmission of blue light than yellow IOLs – important for dim light situations High Abbe number, low Refractive index (1.46 @35o) means less chromatic aberrations & higher contrast sensitivity
Toric Calculator order form, on www.hanitalenses.com
Toric Calculator, on www.hanitalenses.com
Participating centers 180 Total no of eyes (planned) Follow-up visits Clinical Study + Post marketing evaluation Germany, France, Israel, Colombia, Czech republic 9 Participating centers 180 Total no of eyes (planned) Pre-op, surgery, 1 & 3 months Follow-up visits 45 Implanted eyes 14 Eyes with follow-up >1M
Preliminary study for : Clinical Study preliminary results (Sept 2013) Results Preliminary study for : rotational stability & Refraction accuracy
Clinical Study preliminary results (Sept 2013) 70% of patients obtained Cylinder under 0.5D post op
Clinical Study preliminary results (Sept 2013)
Clinical Study preliminary results (Sept 2013) * *Patient with refraction of: Sph=0, Cyl=0
Clinical Study preliminary results (Sept 2013) * Significant rotation (>15º) has occurred in 2 eyes with high AL (>26mm). Both cases are not included above due to short follow-up time (<1M). Due to this, for improved stability in long eyes, IOLs below 16 dpt are provided with external diameter of 11.5mm
- The Hanita VisTor is a MICS lens with toric optics Preliminary conclusions (Sept 2013) - The Hanita VisTor is a MICS lens with toric optics - It can be implanted through 1.8 mm incisions, with no impairment of existing corneal astigmatism - It can be easily positioned, by clockwise and counterclockwise rotation - For improved stability in long eyes, IOLs below 16 dpt are provided with external diameter of 11.5mm - Precise refraction and correction of astigmatism
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