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Femtosecond-assisted astigmatic keratotomy in patients with previous refractive surgery and a low amount of mixed astigmatism

Poster Details

First Author: J.Venter UK

Co Author(s):                  

Abstract Details


To report our initial experience of correction of mixed astigmatism with femtosecond-assisted astigmatic keratotomy in patients with history of refractive surgery.


Optical Express, London, United Kingdom


One hundred and twelve eyes with history of excimer laser surgery, refractive lens exchange/cataract surgery or phakic intraocular lens implant and a low amount of mixed astigmatism refractive error underwent Intralase-assisted astigmatic keratotomy. Outcome measures included uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), subjective refraction and keratometry. Holladay-Carvy-Koch method was used to calculate the surgically induced refractive change (SIRC). Preoperative and postoperative refractive cylinder was displayed on a doubled-angle plot. Six months data are presented in this study.


The average absolute value of subjective cylinder changed from 1.20 D ± 0.47 SD (range 0.50 to 2.75 D) to 0.55 D ± 0.40 SD (range 0 to 2.25 D), p < 0.01. 72% of eyes where within 0.50 D of desired correction when comparing attempted refractive cylinder to the cylinder component of SIRC. Subjective sphere reduced from +0.61 D ± 0.33 SD (range +0.25 to +1.50 D) to +0.17 D ± 0.36 SD (range -0.75 to +1.25 D), p < 0.01. There was an average gain of 2 lines of UDVA, while there was no statistically significant difference between preoperative and postoperative CDVA.


Astigmatic keratotomy performed with the IntraLase laser was effective in reducing refractive error in patients where other surgical options were exhausted. FINANCIAL DISCLOSURE?: No

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