+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

A new concept for the correction of astigmatism: full-arc, depth-dependent astigmatic keratotomy



A new concept for the correction of astigmatism: full-arc, depth-dependent astigmatic keratotomy



Ophthalmology 107(1): 95



The purpose of this study is to introduce and evaluate a new concept in astigmatic keratotomy (AK) named full-arc, depth-dependent AK (FDAK). Noncomparative interventional case series. FDAK was performed on a total of 37 eyes with regular astigmatism; of these, 16 eyes received FDAK alone, and 21 eyes received FDAK combined with cataract surgery. Corneal topography was used to divide the cornea into two discreet regions of "steep" and "flat." Then, paired arcuate incisions, 90 degrees in length, were placed along the full arc of the steep area. The level of astigmatic correction was controlled by varying the incision depth from 40% to 80% on the basis of a provisional nomogram developed by the authors. Keratometries, corneal topographies, and visual acuities were measured. The FDAK alone group showed a significant improvement from a preoperative corneal astigmatism of 2.90 +/- 0.78 diopters (D) to a postoperative value of 0.89 +/- 0.52 D. The "combined" group also showed significant improvement from a preoperative corneal astigmatism of 2.97 +/- 1.01 D, to a postoperative value of 1.02 +/- 0.45 D. The deviation of achieved correction from attempted correction using vector analysis was between 1.37 D of undercorrection and 0.98 D of overcorrection, with 91.9% of cases within the range of +/- 1.0 D. Slight oblique change caused by axis deviation was observed in seven cases. Both uncorrected and corrected visual acuity showed statistically significant improvement. No serious complications were encountered. Controlling the level of correction by varying the incision depth allowed the surgeon to use long incisions (90 degrees in length in regular astigmatism) covering the entire steep area, minimizing the undesirable changes induced by conventional deep and narrow incision AK and resulting in an ideal corneal sphericity after surgery. FDAK enabled the surgeon to accurately control the level of astigmatic correction with minimal risk of corneal perforation.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 045079627

Download citation: RISBibTeXText

PMID: 10647726

DOI: 10.1016/s0161-6420(99)00021-4


Related references

Clinical application of full-arc, depth-dependent, astigmatic keratotomy. Cornea 20(8): 839-843, 2001

Toric Lens Implantation and Astigmatic Keratotomy for the Correction of High Astigmatism. Techniques in Ophthalmology 9(1): 17-23, 2011

Correction of postkeratoplasty astigmatism by femtosecond laser compared with mechanized astigmatic keratotomy. American Journal of Ophthalmology 147(5): 779-87 787.E1, 2009

Correction of high astigmatism with astigmatic keratotomy combined with laser in situ keratomileusis. Journal of Cataract and Refractive Surgery 26(7): 960-966, 2000

IntraLase-enabled astigmatic keratotomy for correction of astigmatism after Descemet stripping automated endothelial keratoplasty: a case report. Cornea 28(9): 1074-1076, 2009

Full-Thickness Astigmatic Keratotomy Combined With Small-Incision Lenticule Extraction to Treat High-Level and Mixed Astigmatism. Cornea 34(12): 1582-1587, 2015

Astigmatic correction by intrastromal astigmatic keratotomy during femtosecond laserassisted cataract surgery: Factors in outcomes. Journal of Cataract & Refractive Surgery 44(2): 202-208, 2018

Astigmatic correction by intrastromal astigmatic keratotomy during femtosecond laser-assisted cataract surgery: Factors in outcomes. Journal of Cataract and Refractive Surgery 44(2): 202-208, 2018

Astigmatic keratotomy for post-keratoplasty astigmatism. Journal of Cataract and Refractive Surgery 32(7): 1175-1179, 2006

Irregular astigmatism after radial and astigmatic keratotomy. American Journal of Ophthalmology 107(1): 42-46, 1989

Femtosecond astigmatic keratotomy for postkeratoplasty astigmatism. Saudi Journal of Ophthalmology 30(3): 163-168, 2017

Femtosecond laser astigmatic keratotomy for postkeratoplasty astigmatism. Canadian Journal of Ophthalmology. Journal Canadien d'Ophtalmologie 43(3): 367-369, 2008

IntraLase-enabled astigmatic keratotomy for postkeratoplasty astigmatism. American Journal of Ophthalmology 146(6): 897-904.E1, 2008

Quantitation of irregular corneal astigmatism after astigmatic keratotomy. Rinsho Ganka 49(6): 1223-1225, 1995

Irregular astigmatism and contrast sensitivity after astigmatic keratotomy. Investigative Ophthalmology & Visual Science 38(4 Part 1-2): S853, 1997