Table of Contents - WOC 2012

WOC2012 Abstract Book
FP-CAT-TH 40 (3)
Evaluation of Rotational Stability of Acrysof and Rayner Toric IOL
Shetty Vijay (1) , Haldipurkar Suhas (1) , Singh Dhirendra (1) , Singh Setia
Maninder (1) , Paik Anirban (1)
1. Laxmi Eye Institute
Aim: To evaluate rotational stability of Acrysof and Rayner toric IOL.
Material and Methods: This prospective study done from Sept 2009 to Feb
2010 included all patients implanted with Acrysof and Rayner toric IOLs.
Intraoperative axis of placement was noted. Postoperative IOL axis was
evaluated between 3 to 12 months on digital photograph using adobe
photoshop software.
Results: Twenty five eyes were implanted with Acrysof toric and 15 eyes were
implanted with Rayner toric IOLs. Mean postoperative IOL rotation was 8.36
and 6.44 degrees in Acrysof and Rayner toric IOLs respectively. Rotation of
Acrysof IOL of less than 5 degrees was seen in 16 eyes (64%), between 5 to
10 degrees in 5 eyes (20%) and more than 10 degrees in 4 eyes (16%). IOL
rotation of Rayner IOL of less than 5 degrees was seen in 10 eyes (67%),
between 5 to 10 degrees in 3 eyes (20%) and more than 10 degrees in 2 eyes
(13%).
Conclusion: Both Acrysof and Rayner toric IOLs demonstrate good rotation
stability.
FP-CAT-TH 40 (4)
Toric IOL Implantation in Cataract Surgery: Femtosecond Laser vs.
Manual Techniques
Lawless Michael (1)
1. Vision Eye Institute
Objective: Standard outcomes from our first Toric IOLs implanted with laser
cataract surgery to those using manual techniques.
Methodology: 50 eyes undergoing cataract surgery with Toric IOL implantation
had femtosecond laser or manually created capsulotomy/corneal incisions.
Accuracy to target refraction and residual astigmatism were measured
between groups at 1 month.
Results: Both groups were well matched. The capsulotomy and laser incisions
were created with exact dimension, which facilitated precise Toric IOL
placement compared with the manual group. Mean residual cylinder was
reduced in the both groups however the laser group provided an additional
reduction.
Conclusions: Laser corneal incisions increased the predictability of surgically
induced astigmatism, improving the accuracy of the toric calculator. Precise
diameter capsulotomy should further reduce tilt and lens decentration which is
a factor in the outcome.
FP-CAT-TH 40 (5)
Implantation of the ReSTOR 3+ in Conjunction with Femtosecond
Laser Assisted Cataract Surgery
Lawless Michael (1)
1. Vision Eye Institute
Objective: To measure the standard visual and refractive outcomes of patients
undergoing implantation of the ReSTOR 3+ multifocal IOL in conjunction with
Femtosecond cataract surgery.
Methodology: 50 eyes undergoing cataract surgery with ReSTOR 3+ were
reviewed. Accuracy to target refraction and visual acuity was assessed.
Results: The average spherical equivalent refraction was 0.00 ± 0.23Ds.
85.7% of patients obtained UDVA of 6/7.5 and UNVA of N6 or better following
surgery. There were no adverse events.
Conclusions: The combination of laser assisted cataract surgery and recent
IOL technology serves to provide patients with excellent results following
surgery. Surgeons can predict, with greater accuracy, the ability to provide
spectacle independency using this combination of technology.
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FP-CAT-TH 40 (6)
Ray-Tracing and Gaussian Optics in IOL Calculation
Haigis Wolfgang (1) , Koberstein Ulrike (1)
1. University of Wuerzburg, Department of Ophthalmology
Objective / Purpose: Several authors have claimed that ray-tracing provides
better refractive outcomes than classical IOL power formulas in Gaussian
optics. To check this hypothesis the refractive outcomes after IOL implantation
were retrospectively compared to predictions from ray-tracing as well as
standard Gaussian optics.
Methods: For 89 pseudophakic eyes of 89 routine cataract patients, the
arithmetic (ME) and absolute (MA) prediction errors (achieved spherical
equivalent (SEV) - predicted refraction) were determined using a commercial
ray tracing software (Okulix, O) as well as the Haigis (H) formula. Six different
IOL types were implanted by 3 surgeons. For IOL calculation in Gaussian optics,
the published ULIB lens constants were used; ray tracing was performed for
a 3 mm pupil.
Results: The mean arithmetic prediction error with ray-tracing was ME(O) =
-0.56 ± 0.93 dpt, with Gaussian optics ME(H) = -0.19 ± 0.82 dpt. The medians
of the absolute prediction errors were MA(O) = 0.65 dpt and MA(H) = 0.38
dpt. The differences between ray-tracing and classical results were statistically
significant (p< 0.001).
Conclusions: Ray-tracing yielded no advantages in refractive outcomes over
the Haigis formula. Classical Gaussian optics results, on the contrary, were
significantly better than ray-tracing based predictions.
FP-CAT-TH 40 (7)
IOL Exchange. The Indications and Surgical Techniques
Izak Milan (1) , Molnarova Maria (1) , Cizmarova-Izakova Andrea (1) ,
Bartos Marcel (1)
1. Eye Clinic, F.D. Roosevelt Hospital, Slovak Healthcare University
Objective/Purpose: To describe the Incidence, Indications and Surgical
techniques of IOL exchange through small incision.
Methods: Comparison of the incidence and reasons for IOL explanation/
exchange in the past (1979-1992) and in the presence (1993-2010).
Results: While in the past the incidence of IOL explantation/exchange was
1,7% /iris clip/, resp. 0,4% /PC IOL/currently the incidence is 0,08% only. The
main reasons for IOL exchange in the past and in the present are discussed.
Conclusion: We are the witnesses of a changing scene for IOL exchange. We
look for the best surgical technique of IOL exchange through the small incision.
The presentation is accompanied by a video.
FP-CAT-TH 40 (8)
Management of Thick Pupillary Membranes with Plasma Knife
Singh Ravijit (1)
1. Dr. Daljit Singh Eye Hospital
Vascularized and non vascularized thick irido-capsular membranes are tough
to manage with conventional cutting tools like the capsulotome , intraocular
scissors or the vitrectomy cutter. These membranes can be sometimes very
thick and tough or may be highly vascularized and bleed excessively on
cutting. We present a paradigm shift in managing a variety of thick pupillary
membranes by the use of a Plasma Knife (Fugo Blade) and we shall share
the use of this devise in diverse clinical situations like congenital, traumatic,
iatrogenic etc. Currently the Plasma Knife is US FDA approved for anterior
capsulotomy and for Transciliary filtration for glaucoma.