CROSS-CYLINDER ABLATION LASIK FOR MIXED ASTIGMATISM

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HASHEMI SEYED HASAN; MIRAFTAB S.M.

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Journal: BINA Year:2004 | Volume:9 | Issue:3 (35) Page(s): 221-228

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Information Journal Paper

Title

CROSS-CYLINDER ABLATION LASIK FOR MIXED ASTIGMATISM

Author(s)

HASHEMI SEYED HASAN | MIRAFTAB S.M. | Issue Writer Certificate

Keywords

LASIKQ3

CROSS CYLINDER ABLATIONQ3

CONTRAST SENSITIVITYQ3

CORNEAL TOPOGRAPHYQ3

MIXED ASTIGMATISMQ3

Abstract

Purpose: To evaluate visual and refractive results, topographic indices, and CONTRAST SENSITIVITY changes after laser in situ keratomilueis (LASIK) for MIXED ASTIGMATISM using the cross-sylinder ablation method with the technolas 217C excimer laser.Method: in a before-after clinical trial, 15 eyes of 8 potions with MIXED ASTIGMATISM wer studied. Refraction and topographic indices including asphericity (Q value), predicted corneal acuity (PCA), and corneal uniformity index (CUI) were derived from Holladay diagnostic summary program (EyeSys 2000 Version) before and after surgery. Contrast sensitivities for spatial frequencies of 3, 6, 12, and 18 cyclesper degree were measured using Vector Vision instrument (CSV 1000).Patients were assessed 1 and 3 months after surgery.Results: Before surgery, the range of astigmatism was -1.50 to -6.50 diapers (D) (mean-3.50±1.36 D) and the spherical component was between +0.25 and +3.50D (mean+1.33±1.30 D). Mean cylinder and spherical refraction reduced from -3.50 and +1.33D before surgery to -0.76 and +0.36 D after surgery, respectively. Three months after surgery, 11 eyes out of 15 (72.7%) had less than -1.00D of astigmatism, all eyes had uncorrected visual acuity (UCVA) of 20/30 or better and 53% of the eyes had an UCVA of 20/20. We found a statistically significant reduction in CONTRAST SENSITIVITY at all mentioned spatial frequencies during the first month which recovered to preoperative values by 3 months after surgery. Asphericity decreased by an average of -0.15±0.16 (P=0.01). PCA and CUI were not changed after surgery.Conclusion: The cross-cylinder ablation method found to be effective for correction of MIXED ASTIGMATISM while the cornea maintains its prolate shape and CONTRAST SENSITIVITY is preserved in all spatial frequencies between 1 and 3 months after surgery.

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APA: Copy

HASHEMI, SEYED HASAN, & MIRAFTAB, S.M.. (2004). CROSS-CYLINDER ABLATION LASIK FOR MIXED ASTIGMATISM. BINA, 9(3 (35)), 221-228. SID. https://sid.ir/paper/372854/en

Vancouver: Copy

HASHEMI SEYED HASAN, MIRAFTAB S.M.. CROSS-CYLINDER ABLATION LASIK FOR MIXED ASTIGMATISM. BINA[Internet]. 2004;9(3 (35)):221-228. Available from: https://sid.ir/paper/372854/en

IEEE: Copy

SEYED HASAN HASHEMI, and S.M. MIRAFTAB, “CROSS-CYLINDER ABLATION LASIK FOR MIXED ASTIGMATISM,” BINA, vol. 9, no. 3 (35), pp. 221–228, 2004, [Online]. Available: https://sid.ir/paper/372854/en

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