Table of Contents - WOC 2012

WOC2012 Abstract Book
FP-PED-TH 51 (11)
Determination of Visual Acuity in Children Using Sweep Visual
Evoked Potential Compared to Conventional Measuring Techniques
Sabry Heba (1) , Elgohary Amira (2)
1. Faculty of Medicine, Alexandria University
2. Faculty of Medicine, Cairo University
Objective: Applicability of sweep visual evoked potential (sVEP) in measuring
visual acuity in children.
Methods: The sVEP test was applied to 10 children showing variable visual
disability. Standard VEP recording techniques were employed. The stimulus
was a horizontal-oriented, sine wave grating. Grating acuity was estimated
by linear extrapolation to zero voltage of the highest spatial frequency peak
in VEP amplitude. Conventional visual acuity measuring was done for every
child, each according to age and mental capacity. Techniques ranged from
preferential looking techniques or single optotypes picture tests for preverbal
and/ or mentally incapacitated children. Older children were tested with
crowded optotypes tests or charts. Visual acuity by sweep VEP test was
compared to acuity measured by conventional techniques.
Results: The sweep VEP acuity was measured and compared to acuities
measured by conventional tools for statistical analysis.
Conclusion: Estimation of visual acuity using sVEP can be considered as an
objective method to determine visual acuity in a reliable and accurate way,
especially in preverbal and mentally incapacitated children. It can also be
used for verification of acuities measured by conventional tools in verbally
inexpressible children.
Free Paper: Cataract
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FP-CAT-TH 52 (1)
Comparison Between Two Aspheric Preloaded IOL Insertion Systems
Mazhry Zia (1)
1. WAPDA Teaching Hospital Complex and Central Park Medical College
Purpose: To compare Croma Quatrix and Zeiss Stabi Aspheric Preloaded IOL
Systems in terms of safety, ease of insertion, visual outcome and complications.
Methods: Prospective study was planned. 25 eyes each were implanted with
Croma Quatrix and Zeiss Stabi Aspheric Preloaded IOL System respectively
during phacoemulsification cataract surgery over a period of one year from
June 2009 to July 2010. All patients were between 40 to 87 years of age.
Patients with capsular rip were excluded from the study. Post operative
assessment was performed one day 1, 1 week, 1 month and every 6 months
thereon. Follow up was 6 months and ranged from 6 months to 20 months.
Results: No biometric surprise was noted. Final visual outcome was in the
range of 6/6-6/12 in the both the groups with no statistically significant
difference. Two IOLs were delivered extraocularly in zeiss group. Centration
was excellent postoperatively in both the groups. Yag cap- needed to be
performed in one eye each group.
Conclusion: Both preloaded IOL Insertion systems were found to be safe and
effective. However Quatrix preloaded IOL system was observed to be more
surgeon friendly in terms of ease of insertion.
80
FP-CAT-TH 52 (2)
TriMics How to Be Neutral
Bovet Jerome (1) , Hojabre Amir (2) , Blondel Jerome (1) , Ngondi Chantal (1)
1. OnO Clinique de l›Oeil
2. OnO Ophtalmoprevessin
Purpose: To demonstrate the surgical induction of corneal astigmatism after
TriMICS and CoMics
Methods: Microincision cataract was done with the TriMICS technique through
a 1.1 mm incision and an Akreos MI60 (Bausch and Lomb) was implanted
though a 1.9 mm incision in a corneoscleral technique. Compare to a CoMICS
technique through a 1.7 mm incision and an Akreos MI60 (Bausch and
Lomb) was implanted though a 1.7 mm incision in a dock technique Pre- and
postoperative astigmatism was evaluated with the Pentacam AR and pre- and
postoperative UCVA and BCVA was documented.
Results: The first results suggest that the TriMICS technique does not induce
any astigmatism and is therefore able to improve the predictability and precision
of Microincision cataract surgery according to our ACVA and BCVA results.
Conclusion: TriMICS seem to be a perfect match to not induce astigmatism
surgery.
FP-CAT-TH 52 (3)
Surgical Technique for Iris Fixation of Foldable Intraocular Lenses
Samir Ahmed (1)
1. Zagazig University
Purpose: To evaluate a new technique of iris fixation of foldable IOL.
Patients and Method: A double armed 10-0 prolene suture is tied to each of the
haptic of foldable IOL. A temporal clear corneal incision is created with 2
paracentesis at the chosen site of fixation. The two straight needles of the
prolene suture is passed one after the other through the corneal tunnel then
through the pupil then passing through the peripheral iris to be retrieved
through the paracentesis. The IOL is folded and implanted. The sutures are
tied to each other through the paracentesis
Results: Twenty five aphakic eyes of 25 patients were included in the study.
The preoperative best corrected visual acuity (BCVA) ranged from 6/60 to 6/12
with a mean of 6/24(0.24 ± 0.12 decimal). The final postoperative BCVA ranged
from 6/24 to 6/9 with a mean of 6/18 (0.33 ± 0.13 decimal).Postoperative
complications were hyphema in 3 cases , transient elevation of the IOP in 2
cases, mild anterior uveitis in 5 cases and mild pigment dispersion on the IOL
in 3 cases.
Conclusion: This technique of iris fixation of foldable IOL is a simple and
reproducible technique to correct aphakia.
FP-CAT-TH 52 (4)
Comparative Evaluation of Two Different Types of lri for Managing
Astigmatism in Patients Undergoing Phacoemulsification
Bansal Rakesh Kumar (1) , Garg Anamika (1) , Sood Sunandan (1)
1. Government Medical College and Hospital 32
Purpose: Compare the effect of two different methods of limbal relaxing
incisions (LRI) on the pre-existing astigmatism in patients undergoing
phacoemulsification.
Methods: Fifty patients having preexisting astigmatismbof ? 1D were
randomized to undergo phacoemulsification with incision along the steep axis
along with LRI (on axis) or phacoemulsification incision at 90D along with LRI.
The incisions were placed at 0.6mm depth.
Results: Preexisting astigmatism was 1.65±0.87 D in on axis group and
1.71±0.67D in off axis group. After LRI it was 1.48±0.97, 0.88±0.69 and
0.73±0.57 in on axis group and was 1.05±0.73, 0.96±0.91 and 0.67±0.41in off
axis group at 1, 3 and 6 months postoperative. Decreased in astigmatism was
more significant in off axis group (p< .003, .001 and .000 at 1, 3 and 6 months
respectively).
Conclusions: LRI is safe and effective to reduce mild to moderate amount of
astigmatism.