English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Aim:  The  aim  of  this  study  is  to  examine  and  compare  the  effect  of  treatment  zone diameter on the results of femtosecond laser-assisted in situ keratomileusis (FS-LASIK) and transphotorefractive keratectomy (PRK) procedures performed for the treatment of myopia. Materials and Methods: This was  a  retrospective  cohort  study. The  study  reviewed medical  files  of  patients who underwent  trans-PRK (2630  eyes)  and FS-LASIK  (879 eyes) in which different treatment area diameters were used. For each type of surgery, the eyes were divided into three groups, based on the treatment zone diameter (6 mm, 6.5 mm. and 7 mm). Results: In the FS-LASIK group, there was no difference in both the safety and efficacy indices  or  in  the  distance  from  the  intended  result  between  the  groups  (P =  0.79, P = 0.57, and P = 0.09, respectively). In myopic trans-PRK, a treatment area of 7 mm was associated with worse outcomes in terms of safety (P = 0.01) and efficacy (P < 0.01) in comparison with the other groups. In addition, a treatment zone of 7 mm was associated with a significantly larger distance from the refractive target (P < 0.001). There were no significant differences between the 6 mm and 6.5 mm groups in any outcome measure. These results recurred in a multivariate analysis, after correcting them for age, gender, pre-operative refractive error, and pachymetry. Conclusions: Different  treatment  zone  sizes  gave  similar  results  in  FS-LASIK, while in  trans-PRK,  a  7 mm  zone was  associated with  inferior  outcomes  in  comparison  to smaller  treatment  zones. Hence,  in  trans-PRK, we  recommend  choosing  a  treatment zone smaller than 7 mm while taking pupillometry into account and opting FS-LASIK whenever a very large treatment zone is required.

clinical and experimental vision and eye research

Effect of treatment zone diameter on the clinical results of femtosecond laser-assisted in situ keratomileusis and trans-photorefractive keratectomy for the correction of myopia