VisTor The new Toric IOL by Hanita Lenses
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Transcript of VisTor The new Toric IOL by Hanita Lenses
VisTorThe new Toric IOL by Hanita Lenses
Sept 2013
Astigmatism - The cornea has different radii (Dpt) in different meridians, causing the focus to spread between two points.
Definition
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…
IOLMaster Topographer
Diagnosis: Regular astigmatism
IOLMaster Topographer
Diagnosis: Irregular Astigmatism
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.
Correction of astigmatism by IOL
VisTor Platform
3600 enhanced square edge decrease PCO
Visible axis marking even for small pupils
Excellent stability in the capsular bag endurance to rotation, tilt & decentration .
Injection through 1.8 mm incision
Aspheric optics
Standard corneal spherical aberration +0.27µ, corrected by natural lens
Designed using Arizona Uni. model, with statistical eye data of old population
Anterior toric surface, posterior aspheric surface
IOL asphericity -0.14, leaving residual +0.13µ for better contrast sensitivity, shown in Prof. Tetz study
Total correction of Toric aberrations
Raw material
Violet light blocker equivalent to natural chromophore .
>10 years clinical experience and > 1 million implantations of Hanita’s IOLs
Hydrophilic acrylic 25% water, produced by Benz R&D (USA)
Better transmission of blue light than yellow IOLs – important for dim light situationsHigh 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
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
Clinical Study + Post marketing evaluation
Clinical Study preliminary results (Sept 2013)
Results
Preliminary study for :rotational stability
&Refraction accuracy
Clinical Study preliminary results (Sept 2013)
PreOp PostOp0.00
0.50
1.00
1.50
2.00
2.50Cylinder Pre-Op vs. Post-Op
Refr
activ
e cy
linde
r (n=
14)
70% of patients obtained Cylinder under 0.5D post op
Clinical Study preliminary results (Sept 2013)
≤ -1.5
-1.5 to -1
-1 to -0
.5
-0.5 to +0
.5
+0.5 to
+1
+1 to
+1.5
+1.5<
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
Spherical equivalent refraction Post-Op (1-3 Months)
Spherical Equivalent Refraction - Targeted refraction (Diopters)
Perc
enta
ge o
f pati
ents
(n=1
4)
Clinical Study preliminary results (Sept 2013)
1 ≤
0.8 to 1
0.6 to 0.8
0.4 to 0.6
0.2 to 0.4
0 to 0.2
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Visual Acuity Post-Op (1-3 Months)
UCVA
BCVA
Visual Acuity (Decimal)
Perc
enta
ge o
f pati
ents
(n=
14)
*Patient with refraction of: Sph=0, Cyl=0
*
Clinical Study preliminary results (Sept 2013)
≤ 33 to
55 to
77 to
9 9<0%
10%
20%
30%
40%
50%
60%
70%
Rotational Stability (1-3 Months)
Deviation from implanted position (Degrees)
Perc
enta
ge o
f pati
ents
(n=1
4)
* 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
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
Thank you