Comparison of laser in situ keratomileusis for myopic astigmatism without iris registration, with iris registration, and with iris registration-assisted dynamic rotational eye tracking.
J Cataract Refract Surg
; 37(3): 574-81, 2011 Mar.
Article
en En
| MEDLINE
| ID: mdl-21333879
ABSTRACT
PURPOSE:
To compare the visual and refractive outcomes of laser in situ keratomileusis (LASIK) without iris registration, with static preablation iris registration, and with preablation iris registration-assisted intra-ablation with dynamic rotational eye tracking.SETTING:
Refractive Surgery Services, Dr. Agarwal's Eye Hospital, Chennai, India.DESIGN:
Randomized clinical trial.METHODS:
Eyes with myopic astigmatism (cylinder >1.00 diopter [D]) had LASIK using the Technolas 217z100 platform. Preoperative and postoperative assessment included uncorrected and corrected distance visual acuities, refraction, topographic analysis, and a routine LASIK workup. All cases were followed for 6 months.RESULTS:
The mean spherical equivalent (SE) was -6.1 D ± 2.4 (SD) with no iris registration, -6.2 D ± 2.3 D with static iris registration, and -6.5 ± 2.2 D with dynamic iris registration (P=.4) preoperatively and -0.27 ± 0.4 D, -0.12 ± 0.4 D, and -0.02 ± 0.35 D, respectively, 6 months postoperatively (P < .001). The mean cylindrical error was -2.05 ± 0.7 D, -2.08 ± 0.5 D, and -2.13 ± 0.7 D, respectively, preoperatively (P=.6) and -0.37 ± 0.2 D, -0.29 ± 0.2 D, and -0.20 ± 0.3 D, respectively, at 6 months (P < .001). Alpins analysis showed comparable target and surgically induced astigmatism between the 3 groups; however, the difference vector, error angle, correction index, success index, and flattening index were best after dynamic iris registration (P < .001).CONCLUSIONS:
In myopic astigmatism, iris registration with dynamic rotational eye tracking gave better results than iris registration alone or no iris registration. The worst outcomes were in cases without iris registration.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Astigmatismo
/
Iris
/
Queratomileusis por Láser In Situ
/
Láseres de Excímeros
/
Miopía
Tipo de estudio:
Clinical_trials
Límite:
Adult
/
Humans
Idioma:
En
Revista:
J Cataract Refract Surg
Asunto de la revista:
OFTALMOLOGIA
Año:
2011
Tipo del documento:
Article
País de afiliación:
India