Regional analysis of posterior corneal elevation after laser refractive surgeries for correction of myopia of different degrees.
Indian J Ophthalmol
; 72(6): 824-830, 2024 Jun 01.
Article
em En
| MEDLINE
| ID: mdl-38317325
ABSTRACT
PURPOSE:
To evaluate regional changes in the posterior corneal elevation after three laser refractive surgeries for correction of myopia of different degrees. SETTINGS ANDDESIGN:
Retrospective, comparative, and non-randomized study.METHODS:
Two hundred patients (200 eyes) who underwent laser epithelial keratoplasty (LASEK), femtosecond-assisted laser in-situ keratomileusis (FS-LASIK), and small-incision lenticule extraction (SMILE) were included in this study. According to preoperative spherical equivalent (SE), each surgical group was divided into two refractive subgroups low-to-moderate myopia (LM group) and high myopia (H group). The posterior corneal elevation from Pentacam Scheimpflug tomography was analyzed preoperatively and at 1 month, 3 months, 6 months, and 12 months postoperatively. Three subregions of the posterior cornea were divided in this study as the central, paracentral, and peripheral regions. STATISTICAL ANALYSIS USED Generalized Estimating Equations (GEE).RESULTS:
For all three surgical groups, similar changing trends were seen in the two refractive subgroups. H group presented a larger changing magnitude than the LM group in FS-LASIK over time ( P < 0.05), whereas no significant difference was noted in the two refractive subgroups of LASEK or SMILE ( P > 0.05). At 12 months postoperatively, the central posterior corneal elevation returned to the preoperative level in LASEK ( P > 0.05) but shifted forward significantly in FS-LASIK and SMILE ( P < 0.05).CONCLUSION:
Different posterior corneal regions respond differently to corneal refractive surgeries. LASEK, FS-LASIK, and SMILE demonstrate different trends in the regional changes in posterior corneal elevation. The corneal shape seems more stable in LASEK than in FS-LASIK and SMILE.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Refração Ocular
/
Acuidade Visual
/
Córnea
/
Topografia da Córnea
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Miopia
Tipo de estudo:
Clinical_trials
Limite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Indian J Ophthalmol
Ano de publicação:
2024
Tipo de documento:
Article