[Impact of Different Percent Tissue Altered Values on Visual Outcome after Refractive Small Incision Lenticule Extraction (ReLEx SMILE)]. / Auswirkung verschiedener Percent-Tissue-altered-Werte auf das Behandlungsergebnis bei refraktiver Small Incision Lenticule Extraction (ReLEx SMILE).
Klin Monbl Augenheilkd
; 234(1): 90-97, 2017 Jan.
Article
em De
| MEDLINE
| ID: mdl-27846649
ABSTRACT
Purpose To compare the visual outcomes after ReLEx SMILE treatment of eyes with low and high PTA values (PTA percent tissue altered) within a follow-up period of up to 3 years and to assess whether a high PTA value might contribute to the development of keratectasia, as is the case for LASIK. Methods This retrospective analysis comprises results from 313 eyes (189 patients) with a PTA value of less than 40â% and of 373 eyes (213 patients) with a PTA value of at least 40â%. Preoperatively and up to 3 years after SMILE surgery, refraction values, monocular corrected (CDVA) and uncorrected distant visual acuity (UDVA) and wavefront data were evaluated. Results One to 3 years after surgery, the group with PTA < 40â% (PTA ≥ 40â%) had a loss of two Snellen lines in 1.1â% (0.0â%) of the cases. Loss of one line occurred in 1.1â% (3.6â%) of the eyes, whereas 97.7â% (96.4â%) remained unchanged or gained lines. With respect to predictability of the spherical equivalent, 92.0â% (78.6â%) of the eyes were within ± 0.5D and 97.7â% (92.9â%) were within ± 1.0D. The group with high PTA values displayed a slightly but significantly greater undercorrection of about 0,25D. 74.4â% (71.8â%) achieved UDVA of at least 20/20 and 96.5â% (87.1â%) achieved at least 20/25. The mean UDVA was - 0.03 ± 0.10logMAR (0.01 ± 0.12logMAR) and its mean difference to the preoperative CDVA was 0.00 ± 0.09logMAR (0.03 ± 0.12logMAR). Conclusion ReLEx SMILE is a safe and effective corneal refractive treatment, even for PTA values of 40â% and more. Eyes with high PTA values did not display any evidence of keratectasia development within the 3-year follow-up of this study.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Complicações Pós-Operatórias
/
Erros de Refração
/
Acuidade Visual
/
Córnea
/
Doenças da Córnea
/
Cirurgia da Córnea a Laser
Tipo de estudo:
Etiology_studies
/
Incidence_studies
/
Observational_studies
/
Prevalence_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
País/Região como assunto:
Europa
Idioma:
De
Revista:
Klin Monbl Augenheilkd
Ano de publicação:
2017
Tipo de documento:
Article