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The changes of posterior corneal surface and high-order aberrations after refractive surgery in moderate myopia.

Lee MJ, Lee SM, Lee HJ, Wee WR, Lee JH, Kim MK - Korean J Ophthalmol (2007)

Bottom Line: The posterior corneal elevation was measured with Orbscan before, 2 and 4 months after surgery.The values of higher-order aberrations were evaluated preoperatively and 2 months postoperatively with Wavefront aberrometer.There were no statistically significant differences among those three groups, and between 2 and 4 months.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Seoul National University College of Medicine, and Seoul Artificial Eye Center, Seoul National University Hospital Clinical Research Institute, Korea.

ABSTRACT

Purpose: To compare forward shift of posterior corneal surface and higher-order aberration (HOA) changes after LASIK, LASEK, and wavefront-guided LASEK surgery in moderate myopia

Methods: One hundred eighty four eyes undergoing LASIK, LASEK and wavefront-guided LASEK with VISX STAR S4 were included in this study. The posterior corneal elevation was measured with Orbscan before, 2 and 4 months after surgery. Changes of the elevation were assessed using the difference map generated from preoperative and postoperative elevation maps. The values of higher-order aberrations were evaluated preoperatively and 2 months postoperatively with Wavefront aberrometer.

Results: The posterior corneal surface displayed forward shift of 27.2+/-11.45 micrometer, 24.3+/-9.76 micrometer in LASIK group, 23.4+/-10.5 micrometer, 23.6+/10.55 micrometer in LASEK group, 24.0+/-14.95 micrometer, 28.4+/-14.72 micrometer in wavefront-guided LASEK group at 2 months and 4 months, respectively. There were no statistically significant differences among those three groups, and between 2 and 4 months. The root mean score (RMS) of HOA was increased after LASIK and LASEK (p=0.000, p=0.000, respectively). The mean change of HOA-RMS was significantly smaller in wavefront-guided LASEK than LASIK or LASEK (p=0.000, p=0.000, respectively, Bonferroni-corrected).

Conclusions: The changes of posterior corneal surface forward shift showed no difference among LASIK, LASEK and wavefront-guided LASEK in moderate myopia. HOAs were significantly increased after LASIK and LASEK. The changes of HOAs were significant smaller in wavefront-guided LASEK than LASIK or LASEK.

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The changes of posterior elevation measured using difference map showed no statistically significant difference between LASIK and LASEK, between LASEK and Wavefront-guided LASEK at 2 and 4 month postoperatively (p>0.05).
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Figure 1: The changes of posterior elevation measured using difference map showed no statistically significant difference between LASIK and LASEK, between LASEK and Wavefront-guided LASEK at 2 and 4 month postoperatively (p>0.05).

Mentions: The mean UCVA and manifest refraction changes at 2 months after surgery are shown in Table 2. There is no statistically significant difference of postoperative visual acuity and manifest refraction among three groups. The mean forward shift of the posterior corneal surface was 27.2±11.45 µm in LASIK eyes (n=53), 23.4±10.5 µm in LASEK eyes (n=75), 24.0±14.9 µm in wavefront-guided LASEK eyes (n=18) at 2 month postoperatively. On the other hand, it was 24.3±9.8 µm in LASIK (n=34), 23.6±10.6 µm in LASEK (n=72), 28.4±14.7 µm in wavefront-guided LASEK (n=16) at 4 month postoperatively. There were no statistically significant difference of posterior elevation among three groups at 2 and 4 months postoperatively (p=0.231, p=0.624, respectively, oneway ANOVA)(Fig. 1).


The changes of posterior corneal surface and high-order aberrations after refractive surgery in moderate myopia.

Lee MJ, Lee SM, Lee HJ, Wee WR, Lee JH, Kim MK - Korean J Ophthalmol (2007)

The changes of posterior elevation measured using difference map showed no statistically significant difference between LASIK and LASEK, between LASEK and Wavefront-guided LASEK at 2 and 4 month postoperatively (p>0.05).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2629672&req=5

Figure 1: The changes of posterior elevation measured using difference map showed no statistically significant difference between LASIK and LASEK, between LASEK and Wavefront-guided LASEK at 2 and 4 month postoperatively (p>0.05).
Mentions: The mean UCVA and manifest refraction changes at 2 months after surgery are shown in Table 2. There is no statistically significant difference of postoperative visual acuity and manifest refraction among three groups. The mean forward shift of the posterior corneal surface was 27.2±11.45 µm in LASIK eyes (n=53), 23.4±10.5 µm in LASEK eyes (n=75), 24.0±14.9 µm in wavefront-guided LASEK eyes (n=18) at 2 month postoperatively. On the other hand, it was 24.3±9.8 µm in LASIK (n=34), 23.6±10.6 µm in LASEK (n=72), 28.4±14.7 µm in wavefront-guided LASEK (n=16) at 4 month postoperatively. There were no statistically significant difference of posterior elevation among three groups at 2 and 4 months postoperatively (p=0.231, p=0.624, respectively, oneway ANOVA)(Fig. 1).

Bottom Line: The posterior corneal elevation was measured with Orbscan before, 2 and 4 months after surgery.The values of higher-order aberrations were evaluated preoperatively and 2 months postoperatively with Wavefront aberrometer.There were no statistically significant differences among those three groups, and between 2 and 4 months.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Seoul National University College of Medicine, and Seoul Artificial Eye Center, Seoul National University Hospital Clinical Research Institute, Korea.

ABSTRACT

Purpose: To compare forward shift of posterior corneal surface and higher-order aberration (HOA) changes after LASIK, LASEK, and wavefront-guided LASEK surgery in moderate myopia

Methods: One hundred eighty four eyes undergoing LASIK, LASEK and wavefront-guided LASEK with VISX STAR S4 were included in this study. The posterior corneal elevation was measured with Orbscan before, 2 and 4 months after surgery. Changes of the elevation were assessed using the difference map generated from preoperative and postoperative elevation maps. The values of higher-order aberrations were evaluated preoperatively and 2 months postoperatively with Wavefront aberrometer.

Results: The posterior corneal surface displayed forward shift of 27.2+/-11.45 micrometer, 24.3+/-9.76 micrometer in LASIK group, 23.4+/-10.5 micrometer, 23.6+/10.55 micrometer in LASEK group, 24.0+/-14.95 micrometer, 28.4+/-14.72 micrometer in wavefront-guided LASEK group at 2 months and 4 months, respectively. There were no statistically significant differences among those three groups, and between 2 and 4 months. The root mean score (RMS) of HOA was increased after LASIK and LASEK (p=0.000, p=0.000, respectively). The mean change of HOA-RMS was significantly smaller in wavefront-guided LASEK than LASIK or LASEK (p=0.000, p=0.000, respectively, Bonferroni-corrected).

Conclusions: The changes of posterior corneal surface forward shift showed no difference among LASIK, LASEK and wavefront-guided LASEK in moderate myopia. HOAs were significantly increased after LASIK and LASEK. The changes of HOAs were significant smaller in wavefront-guided LASEK than LASIK or LASEK.

Show MeSH
Related in: MedlinePlus