Comparison of long-term changes in the effective optical zone following SMILE and FS-LASIK for moderate and high myopia.
BMC Ophthalmol
; 24(1): 388, 2024 Sep 03.
Article
in En
| MEDLINE
| ID: mdl-39227793
ABSTRACT
BACKGROUND:
Visual quality after corneal refractive surgery is linked to the postoperative effective optical zone (EOZ). This study aims to compare long-term changes in the EOZ following small incision lenticule extraction (SMILE) and femtosecond laser-assisted in-situ keratomileusis (FS-LASIK) for moderate and high myopia.METHODS:
This study included 42 patients (72 eyes) who underwent either SMILE (36 eyes) or FS-LASIK (36 eyes). A custom software program based on the tangential curvature difference map of the Pentacam HR (Oculus Optikgeräte GmbH) was used to define the EOZ at 3 and 7 years postoperatively. The EOZ, its chronological changes compared to the programmed optical zone (POZ), and the corneal wavefront aberrations following SMILE and FS-LASIK were analyzed. Correlations between the EOZ changes and relevant parameters were evaluated.RESULTS:
Three years postoperatively, EOZ following SMILE and FS-LASIK were 5.13 ± 0.27 mm and 4.70 ± 0.24 mm (P < 0.001), respectively. Seven years postoperatively, EOZ following SMILE and FS-LASIK decreased to 5.03 ± 0.28 mm and 4.63 ± 0.23 mm (P < 0.001), respectively. At postoperative 7 years, the percentages of EOZ/POZ were negatively correlated with Q-value changes (ß = -5.120, P = 0.009) following SMILE and positively correlated with the cylinder correction (ß = 1.184, P = 0.004) following FS-LASIK. The induced spherical aberrations in the SMILE group were less than those in the FS-LASIK group (P < 0.05) and were negatively correlated with the EOZ/POZ (ß = -16.653, P < 0.001).CONCLUSIONS:
The EOZ following SMILE was larger than that following FS-LASIK in the long postoperative term for moderate and high myopia. Furthermore, a continual reduction in the EOZ was noted after both surgical modalities.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Refraction, Ocular
/
Visual Acuity
/
Corneal Topography
/
Keratomileusis, Laser In Situ
/
Lasers, Excimer
Limits:
Adult
/
Female
/
Humans
/
Male
Language:
En
Journal:
BMC Ophthalmol
Journal subject:
OFTALMOLOGIA
Year:
2024
Document type:
Article
Affiliation country:
China
Country of publication:
United kingdom