Functional optical zone after corneal refractive surgery

Session Details

Session Title: LASIK

Session Date/Time: Monday 12/09/2016 | 08:00-10:30

Paper Time: 09:18

Venue: Hall C3

First Author: : E.Eskina RUSSIA

Co Author(s): :    V. Parshina   O. Kukleva                 

Abstract Details

Purpose:

To evaluate the functional optical zone (FOZ) and influencing parameters among eyes that underwent treatment for myopia and myopic astigmatism with PRK, TransPRK, conventional LASIK and ReLexSMILE.

Setting:

Prof. Erika N. Eskina, MD, Laser Surgery Clinic SPHERE, Moscow, Russia

Methods:

Patients were divided into the groups according to the type of surgery. Each group included 16 patients (32 eyes) (26±5 years, range 21 to 36) with SEQ -5.65D±1,07D (range -4,25D to -7,5D). Patients operated using the SCHWIND AMARIS flying-spot excimer laser system (SCHWIND eye-tech-solutions) and VisuMax femtosecond laser system (CZM) were analysed at 3-6-month postop. Clinical outcomes were evaluated in terms of functional optical zone (FOZ), effective optical zone (EOZ), planned optical zone (POZ), influence from refraction and k-readings and other parameters.

Results:

Planned OZ in PRK, TransPRK, LASIK and ReLex SMILE groups were 6,41± 0,34, 6,43 ± 0,25, 6,58 ± 0,37 and 6,28± 0,6 mm correspondingly. The EOZ Postop in PRK, TransPRK, LASIK and ReLex SMILE groups were 5,66 ± 0,71, 5,94 ± 0,91, 6,23 ± 1,12 and 5,34± 1,34 mm correspondingly. The deviation of EOZ postop from planned was -0,74±0,63; -0,49±0,83; -0,34±0,93 and -0,74±1,1 mm in corresponding groups. No statistical significant correlation had been found for visual acuity, k-readings, topographical astigmatism, ablation depth, pre-op corneal pachymetry.

Conclusions:

Between the TransPRK and ReLex Smile groups there were no statistical significant difference noticeable. The deviation in EOZ postop in these groups was almost the same. The best predictability in EOZ reached was reached in LASIK group. Differences between the post-op FOZ and the POZ are significantly depending on the amount of refractive correction and OZ planned.

Financial Disclosure:

NONE