Table of Contents - WOC 2012

Free Paper: Refractive Surgery
Sun 19 Feb 15:30 - 17:00 Capital Suite 10
FP-REF-SU 344 (1)
Scotopic Measurement of Normal Pupils Pre-Refractive Surgery
Alharbi Faisal (1) , Rushood Adel (2) , Alobeidan Abdulaziz (3)
1. Military Hospital, Dhahran
2. King Fahad Hospital
3. Military Hospital
Purpose: To find out the scotopic pupil size in normal patients coming for
refractive surgery.
Methods: A prospective study of the pupil size of 100 consecutive Saudi
patients (34 females and 66 males) with a mean age of 29.83 years scheduled
for refractive surgery in Kahhal eye Center from March 2003 to May 2003 using
hand-held pupillometer.
Results: Mean scotopic pupil diameter was 6.37mm ± 0.86 (SD) (range 4.0-9.0
mm). Mean scotopic pupil diameter for females was 6.08mm ± 0.83(SD)
(range 4.1-7.8 mm). Mean scotopic pupil diameter for male was 6.51mm ±
0.84(SD) (range 4.0-9.0 mm). Mean scotopic pupil diameter for the right eye
was 6.33mm ± 0.87 (SD) (range 4.1-8.6 mm). Mean sctopic pupil diameter
for the left eye was 6.40mm ± 0.88 (SD) (range 4.0-9.0 mm). Only eighteen
patients (18%) had identical pupils.
Conclusion: A mean scotopic pupil size of 6.37mm with a maximal pupil size of
9.0mm can be expected in our patients. Few patients have identical pupils.
Patients with large pupils should be counseled about the high risk of glare and
halos or the selection of a larger ablation.
FP-REF-SU 344 (2)
Comparison of Asphericity and Spherical Aberration Changes in
Wavefront Guided (WFG) versus Aspheric WFG LASEK Treatment of
Myopic Astigmatism
Hashemian Seyed Javad (1)
1. Eye Reaserch Center,Rasoul Akram Hospital,Tehran Uneversity of Medical
Sciences
Purpose: To evaluate the asphericity and spherical aberration (SA) changes in
patient with myopic astigmatism treated with WFG versus aspheric WFG
LASEK.
Methods: A prospective case control study of 115 eyes with myopic astigmatism
designed in two groups; 58 eyes were treated with WFG and 57 eyes with
aspheric WFG LASEK (Zyoptix, APT). Pre and post operative refraction,
UCDVA, CDVA, amount of Q value and higher order aberration changes were
evaluated.
Results: Pre operative MRSE was -3.32± 1.25 D and mean cylinder was -0.74
± 0.82 D in WFG group and -3.23 ± 1.13 D and – 0.95 ± 0.80 D in aspheric
group respectively. At 12 months MRSE was + 0.17± 0.21 and + 0.27 ± 0.40
respectively. At 12 months Q value increase from-0.185 to 0.394µm in WFG
group and from -0.191 to 0.225 µm in aspheric group (P=0.009).Pre Op mean
SA in WFG group was – 0.029 ± 0.09 ?m and in aspheric group -0.031 ±0.130,
at 12 months was – 0.223 ± 0.17 and -0.112±0.169 respectively (P=0.001).
Conclusions: Our study demonstrates that aspheric WFG LASEK in treatment
of myopic astigmatism is an effective and safe and induce lower amount of SA
and corneal oblation.
WOC2012 Abstract Book
FP-REF-SU 344 (3)
Prevalence of Emmetropia Among Cases of Combined PRK and
Crosslinking in Treatment of Keratoconus
Al-Tuwairqi Waleed (1)
1. Elite Medical and Surgical Center
Purpose: To evaluate the incidence of over and under correction following
combined PRK and crosslinking surgery in keratoconus patients.
Methods: Retrospective study. 100 eyes were included in the study with
moderate degree of keratoconus that underwent combined PRK and
crosslinking in the last 3 years with regular follow up and with no further
intervention for keratoconus treatment. Pre and post operative evaluation of
visual acuity, refraction, corneal topography and patient satisfaction.
Results: Preliminary assessment of the results showed a significant prevalence
of hypermetropia (over correction) among cases of PRK and crosslinking
which requires further statistical analysis.
Conclusion: Although emmetropia is planned, all cases underwent combined
PRK and crosslinking. It was not achieved in a significant number of patients
which will entail further adjustment of the current nomograms.
FP-REF-SU 344 (4)
Wavefront-Guided PRK for Forme Fruste Keratoconus: 3 Years
Results
Shafik Shaheen Mohamed (1)
1. Professor of Opthalmology, University of Alexandria
To evaluate the safety and efficacy of the Wavefront-guide photokeratectomy
in refractive correction of the eyes with forme fruste keratoconus (KCFF)
Prospective study for 33 eyes (19 patients) having KCFF. All eyes were treated
by Wavefront-guided PRK with adjunctive mitomycin-C using VISX Star S4
Excimer Laser. Patients were selected according to the inclusion criteria of the
ectasia committee of ASCRS, ESCRS and AAO. Patients were followed up for
more than 36 months. Patients mean age was 32.6 ± 5.3 years (26 – 42 years).
Their mean cycloplegic refraction was -3.67 ± 1.62 D (-2.50 to - 5.50D). The
preoperative BCVA was 0.93 ± 0.17 (0.8 - 1.2). Mean preoperative pachymetry
was 497 ± 35 µm (460 - 535 µm). Mean ablation depth was 63 ± 13 µm (45 - 75
µm). Mean follow up period was 30 ± 5.4 months (27-39 months). Mean UCVA
was 0.90 ± 0.14 (0.8 -1.2). No single case of ectasia was reported.) Wavefront
guided PRK is an effective and safe technique for correction of refractive errors
in cases of forme fruste keratoconus. The inclusion criteria for these cases
suggested by the ectasia committee seem to be enough to guard against
possible complications.
FP-REF-SU 344 (5)
Evaluation of the SUPRACOR Technique on the Technolas 217P
Excimer Laser for Presbyopic Hyperopia: First Preliminary Results
in Jordan
Alsamady Suhaib (1)
1. Ibn Al Haytham Hospital
Purpose: To analyze the outcomes of the SUPRACOR algorithm when treating
hyperopic presbyopic patients.
Methods: Two sequential groups of hyperopic presbyopic patients were treated
binocularly with SUPRACOR on the Technolas 217P excimer laser (Technolas
Perfect Vision). In Group 1 (6 patients), mean age was 51.7±1.8 years (range:
47-56), with hyperopia of +2.0±0.6 Diopters (D) (range:+1.25 to +3), cylinder of
-0.5 ± 0.3D (range:-0.25 to -1.25), and near addition of +2.0±0.3D (range:+1.75
to +2.25). Follow-up was at 1 week, 3, 6 and 12 months.
Results: Six months postoperatively for Group 1, the mean monocular
uncorrected distance visual acuity (UDVA) was 0.8±0.13 (Range: 0.63–1.0)
and near vision was Jaeger (J) 1.125±0.3 (range: J2 – J1+). Mean Spherical
Equivalent Refraction was -0.57±0.26D (range:-0.125 to -1). 100% achieved
monocular UDVA of 0.63 or better, 83% were 0.8 or more. 100% had
monocular uncorrected near visual acuity of J2 or better, with 83.3% at J1 or
better. Further data on Group 2 patients will also be presented.
Conclusions: SUPRACOR is safe and efficient, providing improved near vision,
while maintaining good distance vision. Patients are happy with their vision at
all distances. No re-treatments have been required during 6 months follow-up
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