comparison of tecnolas and allegretto l aser in s itu k eratomileusis o utcomes in h yperopia
DESCRIPTION
Faik Orucov*, MD, Sinan Goker*,MD, Abraham Solomon**, MD, Joseph Frucht-Pery**, MD *Refractive Surgery Department, ISTANBUL SURGERY HOSPITAL Istanbul, Turkey. Comparison of Tecnolas and Allegretto L aser in S itu K eratomileusis O utcomes in H yperopia. - PowerPoint PPT PresentationTRANSCRIPT
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Faik Orucov*, MD, Sinan Goker*,MD,
Abraham Solomon**, MD, Joseph Frucht-Pery**, MD
*Refractive Surgery Department,*Refractive Surgery Department,ISTANBUL SURGERY HOSPITALISTANBUL SURGERY HOSPITALIstanbul, TurkeyIstanbul, Turkey
Comparison of Tecnolas and Allegretto Comparison of Tecnolas and Allegretto LLaser in aser in SSitu itu KKeratomileusis eratomileusis OOutcomes in utcomes in HHyperopiayperopia
** Hadassah University ** Hadassah University Hospital, Jerusalem, IsraelHospital, Jerusalem, Israel
Authors have no financial interests in any of the mentioned products or companies
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Hyperopia
Hyperopia ≥ 2D 6% of population
Low Hyperopia
good vision in young
poor vision in adults
Hyperopia affects both distance and near vision and is compounded by presbyopia
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Hyperopic Correction
ThermokeratoplastyThermokeratoplastyHexogonal keratotomyHexogonal keratotomyKeratophakiaKeratophakiaHelmium laserHelmium laserKeratomileusısKeratomileusısCKCKH-PRKH-PRKH-LASIKH-LASIKPhakic IOLsPhakic IOLsRLERLE
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PROBLEMS IN HYPEROPIA
Pt’s age > 40
- Dry eyes
- BMD
- More epithelial defects
Flap size 9.5 mm
- Small eyes and pannus
(limbal bleeding)
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PROBLEMS IN HYPEROPIA
Large area of treatment
Long ablation time
Centration is critical
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PROBLEMS IN HYPEROPIA
Initial overcorrection
(myopia)
Slow regression
[1 y. in high hyperopia]
Enhancement is complicated
Final K-reading < 50 [D]
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Hyperopic correction is significantly more likely to regress
Regression greater than myopic correction.
The possibility of regression;
hyperplastic healing response of the cornea to fill in this ablated step between the treated and untreated zones, thereby not only resulting in loss of effect over time but also inducing an astigmatic error in case of uneven fill-ins.
i s t a n b u l c e r r a h i h a s t a n e s i
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PURPOSE
To compare visual outcome measurements in laser in situ keratomileusis (LASIK) for hyperopia using the Technolas 217 and Allegretto excimer laser.
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METHODS
Two-center retrospective study
H-LASIK by the Technolas 217; 50 eyes
(Hadassah Medical Organization, Jeruasalem, (2003 and 2005))
H-LASIK by Allegretto excimer laser ; 42 eyes
(Istanbul Surgery Hospital, Istanbul, (2004 and 2005))
Mean follow-up 23.1±13.7 months with Technolas
19.3±8.8 months with Allegretto.
Inclusion criteria; - SE up to 4.00 diopters (D) of sycloplegic
hyperopia,
- Minimum F/U 12 months
Exclusion criteria; - Incomplete documentation
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RESULTS
Technolas Allegretto P
SE (Mean) Preoperative +2.51±0.78 (D) +2.37±0.81 (D) 0.386
Postoperative -0.01 ±0.58 -0.003 ±0.41 0.912
Optical zone & Ablation depth
Technolas Allegretto P
Optical zone (Mean) 6.0±0.1mm 6.8±0.25 <0.001
Ablation depth (Mean) 68.1±21.2μ 49.8±18.3μ <0.001
SE
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Stability
Higher Myopic overcorrection on the next day
Greater regression observed during first month
Regression (month 1 to last visit) : Technolas +0.48 D
Allegretto +0.36 D (P=0.247)
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UCVA
The postoperative UCVA was significantly lower in eyes treated with Tecnolas on postoperative month 1 (P=.037) . At 3, 6 ,12 months and at last visit postoperatively, no significant differences were noted in UCVA between the two lasers (P=.065 to .473).
Technolas Allegretto P
UCVA
1 Month 0,69 ± 0,25 0,81 ± 0,26 0,032
12 Months 0,80 ± 0,18 0,85 ± 0,18 0,473
Last visit 0,80 ± 0,22 0,86 ±0,17 0,126
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BCVA
0.97±0.10
0.94±0.15
0.96±0.09
0.92±0.15
P= 0.239P= 0.144
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Predictability
i s t a n b u l c e r r a h i h a s t a n e s i
Postoperative (last visit) Technolas Allegretto
UCVA ≥ 20/25 55.8% 69.0%
±0.50 D 69.0% 78.7%,
BSCVA
loss of ≥ 1 lines 11.4% 4.8%
gain of ≥ 1 lines 19.2% 16.7%.
Efficacy & SafetyEfficacy & Safety
Technolas Allegretto P
Safety 1.03±0.12 1.01±0.05 0.409
Efficacy 0.87±0.21 0.90±0.16 0.444
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CONCLUSION
Ablation depth was greater with Technolas laser.
Visual and refractive results were similar between the Technolas and Allegretto laser systems after 3 months of the procedure.