TY - JOUR
T1 - Efficacy of laser in situ keratomileusis in correcting anterior and non-anterior corneal astigmatism
T2 - Comparative study
AU - Kugler, Lance
AU - Cohen, Ilan
AU - Haddad, Walid
AU - Wang, Ming X.
PY - 2010/10
Y1 - 2010/10
N2 - Purpose: To compare the efficacy of conventional laser in situ keratomileusis (LASIK) in treating corneal astigmatism and in treating noncorneal ocular residual astigmatism. Setting: Private practice, Nashville, Tennessee, USA. Design: Retrospective case series. Methods: The records of dominant eyes of consecutive patients who had LASIK were retrospectively analyzed to compare the efficacy of LASIK in eyes with predominantly anterior corneal astigmatism with the efficacy in eyes with predominantly ocular residual astigmatism (ORA). The ORA was determined by vector analysis using refractive cylinder and topographic astigmatism. Preoperatively, the ratio of ORA to preoperative refractive cylinder (R) was used to divide the patients into 2 groups; that is, eyes with predominantly anterior corneal astigmatism (ORA/R ratio <1.0) and eyes with predominantly ORA (ORA/R ratio ≥1.0). Efficacy was determined by examining the magnitude of the remaining uncorrected astigmatism and comparing the index of success (proportion of preoperative refractive astigmatism that remained uncorrected by LASIK) between the 2 groups. Results: The study evaluated 61 eyes of 61 patients. Conventional LASIK was twice as efficacious in the low-ORA group as in the high-ORA group. The index of success was 0.24 and 0.50, respectively, and the difference between groups was statistically significant (P = .036). Conclusion: The efficacy of astigmatic correction by LASIK was significantly higher in eyes in which the preoperative refractive astigmatism was located mainly on the anterior corneal surface than in eyes in which it was mainly located posterior to the anterior corneal surface.
AB - Purpose: To compare the efficacy of conventional laser in situ keratomileusis (LASIK) in treating corneal astigmatism and in treating noncorneal ocular residual astigmatism. Setting: Private practice, Nashville, Tennessee, USA. Design: Retrospective case series. Methods: The records of dominant eyes of consecutive patients who had LASIK were retrospectively analyzed to compare the efficacy of LASIK in eyes with predominantly anterior corneal astigmatism with the efficacy in eyes with predominantly ocular residual astigmatism (ORA). The ORA was determined by vector analysis using refractive cylinder and topographic astigmatism. Preoperatively, the ratio of ORA to preoperative refractive cylinder (R) was used to divide the patients into 2 groups; that is, eyes with predominantly anterior corneal astigmatism (ORA/R ratio <1.0) and eyes with predominantly ORA (ORA/R ratio ≥1.0). Efficacy was determined by examining the magnitude of the remaining uncorrected astigmatism and comparing the index of success (proportion of preoperative refractive astigmatism that remained uncorrected by LASIK) between the 2 groups. Results: The study evaluated 61 eyes of 61 patients. Conventional LASIK was twice as efficacious in the low-ORA group as in the high-ORA group. The index of success was 0.24 and 0.50, respectively, and the difference between groups was statistically significant (P = .036). Conclusion: The efficacy of astigmatic correction by LASIK was significantly higher in eyes in which the preoperative refractive astigmatism was located mainly on the anterior corneal surface than in eyes in which it was mainly located posterior to the anterior corneal surface.
UR - http://www.scopus.com/inward/record.url?scp=77957782168&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77957782168&partnerID=8YFLogxK
U2 - 10.1016/j.jcrs.2010.05.014
DO - 10.1016/j.jcrs.2010.05.014
M3 - Article
C2 - 20870122
AN - SCOPUS:77957782168
SN - 0886-3350
VL - 36
SP - 1745
EP - 1752
JO - Journal of cataract and refractive surgery
JF - Journal of cataract and refractive surgery
IS - 10
ER -