Table of Contents - WOC 2012

WOC2012 Abstract Book
FP-CAT-MO 369 (9)
Achieving Accurate Postoperative Refraction with the Artificial
Accommodation System
Rheinschmitt Liane (1) , Rheinschmitt Liane (1) , Gengenbach Ulrich (1) ,
Bretthauer Georg (1) , Guthoff Rudolf Friedrich (2)
1. Karlsruhe Institute of Technology
2. University of Rostock, Department of Ophthalmology
Objective/Purpose: The Artificial Accommodation System (AAS) is a micromechatronic
implant aiming at restoring accommodation in case of presbyopia
and cataract. Like common IOLs, the AAS will be implanted into the capsular
bag of the eye, and thus, precise axial length assessment is required to obtain
optimal refraction for individual biometry. Despite modern measurement
devices, predictability of refraction is limited due to tolerances of final implant
position after shrinkage of the capsular bag or effects of potential corneal
refractive surgeries.
Methods: To compensate for possible refraction errors at any target distance,
the AAS will be equipped with a wireless communication interface. Thus, the
ophthalmologist will be enabled to postoperatively fine-tune optical parameters
to provide optimal refraction for the implant user.
Results: The exchange of control commands between an external programming
device (ophthalmologist) and the AAS is realized via inductive coupling or
radiofrequency communication. To ensure authenticity and privacy of all
transmitted data, symmetric cryptography is applied.
Conclusion: Via secure wireless communication, the ophthalmologist is
enabled to calibrate the AAS after surgery and later on during patient followup.
Thus, optical parameters of the system can be adjusted to meet specific
needs of the implant user.
FP-CAT-MO 369 (10)
Manual Small Incision Cataract Surgery - A New Instrument
Szetu John (1)
1. Pacific Eye Institute
Objective: To introduce a new method of extracting the cataract lens during
manual small incision cataract surgery (MSICS).
Methods: A new technique of nuclear extraction using a modified spiked vectis
is discussed.
Result and Discussion: Phacoemulsification is still unaffordable in the
developing world hence cataract surgery will continue to evolve as surgeons
continue to explore new techniques that are most appropriate, affordable and
safe. New techniques have evolved around wound construction and access
to the cataract. Early visual rehabilitation and better unaided vision can be
achieved mainly by the architecture of the wound and reducing the wound size.
MSICS involves the manual removal of the nucleus through a scleral tunnel
by many techniques. The spiked irrigating vectis combines mechanical and
hydrostatic pressure to extract the nucleus which can easily be extracted with
ease even without the latter. This allows the wound to be smaller.
Conclusion: MSICS by this modified spiked irrigating vectis is a good alternative
to other techniques of nucleus extraction in terms of applicability, effective,
safe, shorter learning curve for trainees, smaller wound size hence less
astigmatism and cost-effectiveness in the developing world.
356
FP-CAT-MO 369 (11)
Sagittal Phaco Chop Technique
Chiali Abdel Illah (1)
1. Clinique de la Vision
Purpose: To introduce a new technique using the sagittal phaco chop in
cataract surgery.
Methods: 285 cataracts were operated by the same surgeon using a sagittal
Phaco Chop technique. The capsulorhexis size must be between 6 and 8 mm
and at the same time with a Chang canula under the anterior capsule you
perform rotation and elevation of the head of the nucleus. This maneuver will
set the whole nucleus out of its bag in a sagittal position inside the anterior
chamber. When, with a high vacuum the phaco probe is holding the nucleus,
the chopper is sagittally chopping the nucleus in many quadrants and pieces.
Even you miss your capsulorhexis, this technique remains very helpful. This
technique is only used for cataracts grade 3 to 5.
Results: The unique position of the nucleus in the anterior chamber makes the
surgery safer, since there is no stress on the zonula. You operate far away from
the posterior capsule and far away from the endothelio descemet membrane.
Conclusion: A very safe technique which any phaco chop surgeon must have
in his directory. A complete video shows this Sagittal Phaco Chop technique.
Implantation Techniques of Intraocular Lenses in the Presence of
Insufficient or Absent Capsular Support
Mon 20 Feb 8:30 - 10:00 Capital Suite 2
CO-CAT-MO 370
Implantation Techniques of Intraocular Lenses in the Presence of
Insufficient or Absent Capsular Support
Sciscio Andrea (1) , Borasio Edmondo (1) , Zinicola Edoardo (1)
1. Moorfields Eye Hospital
Objective: Have you ever found yourself in a situation where you have to
decide intraoperatively to change your routine in the bag intraocular lens (IOL)
implantation? Look no further, with this course you will have a methodological
and evidence based approach on how to deal with such situations effectively.
Summary of Content: The most important techniques of IOL implantation are
described: trans-scleral fixation in the posterior chamber, anterior chamber
angle supported IOL implantation, sulcus fixation with or without haptics/
optic capture and anterior or posterior iris clip lenses are described. Step by
step video instructions on how to plan and perform the above techniques.
Management of intra and post operative complications. Scientific evidence
on how to select the most appropriate surgical approach as well as literature
support.
Target Audience: General Ophthalmologists
Educational Level: Intermediate