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Session Title: Surface Ablation I
Session Date/Time: Sunday 06/10/2013 | 08:00-09:30
Paper Time: 08:54
Venue: Main Lecture Hall (Ground Floor)
First Author: : E.Eskina RUSSIA
Co Author(s): : O. Riabenko I. Yushkova V. Parshina
Evaluation of clinical outcomes in terms of refraction, vision and contrast sensitivity among high myopic eyes, which underwent a surface treatment with laser epithelial removing.
Prof. Erika N. Eskina, MD, Laser surgery clinic SPHERE, Moscow, Russia
60 cases with a mean pre-op SEQ of -7.14 D (range -4.0 D up to -10.0 D) and a mean decimal visual acuity of 0.98 (range 0.8 to 1.0) were planned as TransPRK treatments with the CAM software (Schwind) where the excimer laser is utilized for epithelial removal and for correcting the refractive deficit within a single step using one ablation profile for the entire tissue removal. In all patients Mitomycin C post laser ablation has been carried out. For ablation the Schwind AMARIS with 500 Hz pulse frequency had been used in conjunction of a 5 D eye-tracker and static cyclotorsion compensation. All data had been analysed in terms of predictability, refraction, vision, safety and for the contrast sensitivity the ZEBRA N 3 (Astrainform) had been used.
At the time of submission not all eyes had completed the 6-month post-operative cycle. However the 6 months follow up showed that 35% of eyes were within ±0.13D and 59% within ±0.50D. Mean pre-op BCVA was 0.98 and mean post-op UCVA was 1,08 whereas 11% achieved an UCVA of 1.2, 78% an UCVA of 1.0 and all patients were better or equal 0.8. Post-operative contrast sensitivity at moderate spatial frequency was better than the pre-operative. Epithelial closing was in 72% within 3 days and latest within 5 days.
This method of a transepithelial surface treatment is a very elegant procedure with a minimum of discomfort for the patient. The efficient one-step epithelial removal and refractive correction with identical zone size provides a quick healing and comparable refractive results as with LASIK. Reliable and superior results up to my personal limit for high myopic refractive corrections of -10 D in the spherical equivalent provided no side effects and Haze remained in all situations under degree 0,5. No retreatment was performed.
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