Static cyclotorsion measurements using the Schwind Amaris laser.
نویسندگان
چکیده
PURPOSE To assess the reliability and reproducibility of static cyclotorsion correction (SCC) measurements made using the Schwind Amaris Excimer laser in patients undergoing LASIK or PRK, and compare the outcomes of treating astigmatism with and without SCC. METHODS Eighty eyes of 40 patients were included in this study. All eyes underwent 2 or 3 sets of five measurements: before and after speculum placement, and after flap-lift (in LASIK cases). We assessed the reproducibility, accuracy, and the percentage of “no catch” measurements. The astigmatism was calculated pre-and 3-months-postoperatively by vector analysis. RESULTS The mean age of the patients was 23.67 ・} 4.19 years. Preoperative spherical equivalent and astigmatism were -2.56 ・} 2.86 D and +1.36 ・} 0.98 D, respectively. The mean measurement time was 15.1 seconds per measurement. The percentages of “no catch” were: 63.8%, 14.9%, and 26.9%; pre-speculum, post-speculum, and post flap-lift, respectively. Cyclotorsion of ≥}2° was seen in 41.25% and 66% of the cases before and after the flap-lift, respectively. Significant cyclotorsion (≥}5°) was seen in 12.50% and 18% of the eyes pre and post flap-lift. The mean astigmatism dropped from +1.53 D@1° to +0.34D@3° when SCC was used and from +1.86D@1° to +0.23D@7° when SCC was not used. No statistical difference was noticed between the groups (p>0.05) in the postoperative residual astigmatism. A postoperative astigmatism of ≥ D was seen in 10% and 20% of eyes with and without SCC, respectively (p<0.01). CONCLUSION Although not always feasible, the SCC measurement is a simple and useful tool. Postoperative astigmatism showed less variability when SCC was used.
منابع مشابه
Comparative evaluation of visual outcomes and corneal asphericity after laser-assisted in situ keratomileusis with the six-dimension Amaris excimer laser system
PURPOSE To compare the visual and refractive outcomes after laser-assisted in situ keratomileusis (LASIK) surgery for correction of myopia or myopic astigmatism using a six-dimensional Amaris excimer laser. METHODS In this retrospective cohort study, we enrolled 47 eyes of 28 patients (age: 19-36 years) with myopia or myopic astigmatism. We used the Custom Ablation Manager protocol and perfor...
متن کاملRefractive Surgery Feature Story
H uman eyes are capable of six types of movement: x/y lateral shifts, z levelling, horizontal and vertical rotations, and cyclotorsion (rotation around the optical axis). Current laser technology for refractive surgery creates corneal alterations to correct refractive errors more accurately than in the past.1 Ablation profiles are based on the removal of tissue lenticules through sequential las...
متن کاملDetection of static cyclotorsion and compensation for dynamic cyclotorsion in laser in situ keratomileusis.
PURPOSE To evaluate the degree of static and dynamic cyclotorsion using a rotational eye tracker in laser in situ keratomileusis (LASIK) to correct myopic astigmatism. SETTING Rothschild Foundation, Paris, France. DESIGN Cohort study. METHODS Laser in situ keratomileusis with active iris registration using a Zyoptix 100 Hz excimer laser with Advanced Control Eyetracking was performed in e...
متن کاملAnalysis of seasonal changes in residual refraction 1-year after corneal laser refractive surgery: a retrospective study.
PURPOSE To analyze the effect of seasonal changes in residual refraction 1-year after corneal refractive surgery using the SCHWIND AMARIS laser system. METHODS 5740 consecutive treatments have been retrospectively reviewed. For all eyes, aspheric treatments were planned with the Custom Ablation Manager software and the ablations were performed with the SCHWIND AMARIS system (SCHWIND eye-tech-...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Arquivos brasileiros de oftalmologia
دوره 77 3 شماره
صفحات -
تاریخ انتشار 2014