Transcript VisTor The new Toric IOL by Hanita Lenses

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
Clinical Study + Post marketing evaluation
Participating centers
Total no of eyes (planned)
9
Germany, France,
Israel, Colombia,
Czech republic
180
Pre-op, surgery, 1 & 3
months
Follow-up visits
Implanted eyes
45
Eyes with follow-up >1M
14
Clinical Study preliminary results (Sept 2013)
Results
Preliminary study for :
rotational stability
&
Refraction accuracy
Clinical Study preliminary results (Sept 2013)
Refractive cylinder (n=14)
Cylinder Pre-Op vs. Post-Op
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
PreOp
PostOp
70% of patients obtained Cylinder under 0.5D post op
Clinical Study preliminary results (Sept 2013)
Spherical equivalent refraction Post-Op (1-3 Months)
Percentage of patients (n=14)
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
Spherical Equivalent Refraction - Targeted refraction (Diopters)
Clinical Study preliminary results (Sept 2013)
Visual Acuity Post-Op (1-3 Months)
Percentage of patients (n=14)
100%
90%
80%
UCVA
70%
BCVA
60%
50%
40%
30%
20%
10%
*
0%
Visual Acuity (Decimal)
*Patient with refraction of: Sph=0, Cyl=0
Clinical Study preliminary results (Sept 2013)
Rotational Stability (1-3 Months)
Percentage of patients (n=14)
70%
60%
50%
40%
30%
20%
10%
0%
Deviation from implanted position (Degrees)
* 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