Table of Contents - WOC 2012

FP-REF-SU 270 (2)
Refractive and Aberrometric Differences Between LASEK,
Mechanical Microkeratome LASIK and Femtosecond LASIK in
Treating Low and Moderate Myopia
Hantera Mohamed (1) , Al Sayyed Fady (2) , Jouhargy Serene (3)
1. Batal Eye Center
2. Magrabi Eye Center
3. Dr. Soliman Fakeeh Hospital
Purpose: A prospective study to determine the best treatment option for
patients with low-to-moderate spherical myopia or myopic astigmatism who
are considered equally eligible to 3 modalities of treatment.
Methods: Fourty-six adult patients (86 eyes) who underwent LASEK with MMC
(31 eyes), and mechanical microkeratome LASIK (23 eyes) or Femtosecond
LASIK (32 eyes) were assessed for clinical outcomes 1, 3 and 6 months postoperatively.
Results: Six months after surgery, all eyes in all three groups were within 1 D
of the intended refractive change. UCVA 20/20 or better was achieved in
96% of eyes undergoing LASEK with MMC 88% of eyes in the mechanical
microkeratome LASIK and 72% of eyes in the Femtosecond LASIK group
at 6 months. Mean spherical equivalent was -0.12 ± 0.22 D, -0.09 ± 0.28 D
and -0.25 ± 0.28 D in the three groups, respectively (p=0.077). Patients in the
LASEK with MMC group had less high order aberrations at 3 and 6 months
compared to the two LASIK groups.
Conclusions: After an initially slower visual improvement, LASEK with MMC,
and to lesser extent, LASIK with mechanical microkeratome, produced better
visual acuity and less corneal aberrations compared to Femtosecond LASIK at
3 and 6 months after surgery.
FP-REF-SU 270 (3)
Corneal Endothelial Cell Count Variation After LASIK by Mechanical
Keratome and Femtosecond LASIK
Mirchia Rajiv (1) , Pahwa Sahil (1) , Mirchia Kanish (1) , Mirchia Sana (1)
1. Mirchia Laser Eye Centre
Purpose: To compare the effect of LASIK on endothelial cell density after
femtosecond LASIK and mechanical SBK.
Methods: 10 patients undergoing LASIK were enrolled in two groups. Pre and
post operative (1 month) endothelial cell density (ECD) was recorded by
NIDEKSP300microscope and variation between pre and post LASIK values
analyzed for each group and difference between 2 groups analysed.
Results: Mean ECD in mechanical SBK group was 2462.76 preoperatively and
2459.46 postoperatively. In femtosecond group the values were 2456.34 and
2453.79.The p-values for difference among the same group and between both
groups were statistically insignificant.
Conclusion: No additional drop in cell density is noted after femtosecond
assisted LASIK.
FP-REF-SU 270 (4)
Clinical Results after Epi-Lasik for Myopic Eyes with Thin Corneas
Alghassaly Yahya (1) , Shaher Aziz (1) , Alkhateb Tawfik (1) , Alansi Horia (1)
1. Althawra Hospital
Purpose: To evaluate the safety and efficacy of Epi-LASIK for correction of low
to moderate myopia.
Methods: 88 eyes of 44 patients with myopia underwent epi-LASIK using
epikeratome and ablation using excimer laser. The enrolled patients were
followed-up daily until the epitheliazation was complete, then at 1, 3, 6, and
12 months postoperative intervals. During each visit, pre and post operative
spherical equivalent (SE), uncorrected visual acuity (UCVA), and best spectacle
corrected visual acuity (BSCVA), postoperative pain, epithelial healing time,
corneal haze and complications were recorded.
Results: The mean epithelialization time was 4.53±0.62 days, range, 4 to 7
days. The UCVA was 20/20 or better in 81 (92.1%) eyes after surgery. The
mean preoperative SE was-3.9± 2.05 diopters (D), range, -8.25 to 1 D, and
improved to -0.06 ± 0.48 D, range, -1.5 to +1 D, postoperatively with 79 (89.8%)
eyes within 0.50 D of target refraction whereas 18 (20.5%) eyes had 1 or more
lines gain of preoperative BSCVA and no eye lost any line of preoperative
BSCVA. 5 (5.7%) eyes had insignificant (trace) haze. No complication was
encountered.
Conclusion: The Epi-LASIK is a safe and efficient technique for correction of
low to moderate myopia in eyes with thin corneas.
FP-REF-SU 270 (5)
IntraLase LASIK Results, Conventional and Customized
Gamaly Tamer (1)
1. Magrabi Eye and Ear Center
WOC2012 Abstract Book
Purpose: To analyze the results of IntraLase lASIK using the IntraLase and
Nidek NAVEX excimer laser system with either conventional OATz or OPDCAT
ablation profile to correct compound myopic astigmatism.
Methods: In a prospective study, the IL LASIK was used to treat patients with
compound myopic astigmatism. Either conventional OATz or OPDCAT were
used. Conventional was performed in 50 eyes of 29 patients, OATZ was
performed in 84 eyes of 47 patients, and OPDCAT was performed in 8 eyes
of 6 patients. Nidek OPD-Scan II was used to measure the eyes. Eyes were
treated with oZ of at least 5.00 mm, and a tZ of maximum 9.00 mm. TED and
OTE were used in cases of OATz & OPDCAT.
Results: Mean follow-up was 12 months. At baseline, the mean preoperative
sE and range for each group was measured. At last follow-up, UCVA, refraction
& BSCVA were measured. No patient reported significant glare or night vision
problems on subjective questionnaire.
Conclusion: IL LASIK and the Nidek NAVEX system were safe, effective and
predictable in correcting compound myopic astigmatism in all Profiles. In both
the OATz & OPDCAT ablation Profiles, patients were satisfied with their quality
of vision.
FP-REF-SU 270 (6)
A Prospective Study Comparing Thin-Flap LASIK (Sub-Bowman
Keratomileusis), One Use-Plus SBK Microkeratome (Moria, Antony,
France) with Photorefractive Keratectomy
Althomali Talal (1)
1. Taif University
Purpose: To Evaluate the flap thickness in SBK LASIK group to determine the
differences in the visual results, , biomechanical effect, quality of vision,
and higher-order aberrations, in eyes undergoing either photorefractive
keratectomy (PRK) or thin-flap LASIK/sub-Bowman keratomileusis at 1, 3, and
6 months after surgery.
Methods: Fifty patients (100 eyes) were enrolled for each study, results From
SBK LASIK group the average central corneal flap was 84 ±8 µm in the right
eye and 85 ±7 µm in the left (range, 72-102 µm), At 1 month: UCVA results
showed a statistically significant difference: SBK, 92% 20/20 or better vs. 72%
20/20 or better for PRK. At3-MO: UCVA was 84% 20/20 or better for PRK and
94% for SBK. At 6 months: UCVA was 95% 20/20 or better for PRK and 94%
for SBK.
Conclusion: At 6 months, there were no statistical differences between the 2
groups. The average central corneal flap was 84 ±8 µm in the right eye and 85
±7 µm in the left (range, 72-102 µm) for SBK LASIK group.
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