Details

Autor(en) / Beteiligte

• Prakash, Gaurav, MD
• Agarwal, Amar, MS, FRCS, FRCOphth
• Ashok Kumar, Dhivya, MD
• Jacob, Soosan, MS, DNB, FRCS
• Agarwal, Athiya, MD, DO

Titel

Comparison of laser in situ keratomileusis for myopic astigmatism without iris registration, with iris registration, and with iris registration–assisted dynamic rotational eye tracking

Ist Teil von

• Journal of cataract and refractive surgery, 2011-03, Vol.37 (3), p.574-581

Ort / Verlag

New York, NY: Elsevier

Erscheinungsjahr

2011

Quelle

MEDLINE

Beschreibungen/Notizen

• 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. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned. Additional disclosures are found in the footnotes.