Sheludchenko V M, Fadeykina T
New Line Vision Ophthalmology Research Centre, Moscow, Russia.
J Refract Surg. 2001 Mar-Apr;17(2 Suppl):S238-41. doi: 10.3928/1081-597X-20010302-20.
To investigate results of excimer laser correction for mixed astigmatism, using two kinds of corneal photoablation; bitoric nomograms for cylinder and standard monotoric procedures.
Intrastromal photoablation was performed with the Nidek EC-5000 excimer laser and a lamellar keratotomy was created with the Hansatome microkeratome. We selected 46 cases with mixed astigmatism. The first group included 28 eyes (average cylinder 4.15 +/- 0.86 D, sphere 1.37 +/- 0.18 D). In this group, procedures were performed using bitoric nomograms. The second group included 18 eyes (average cylinder 4.05 +/- 0.64 D, sphere 1.67 +/- 0.23 D). In this group ablation was performed with monotoric nomograms.
After 6 months in the bitoric group, average residual cylinder was 1.49 +/- 0.24 D, and sphere was -0.57 +/- 0.31 D. In seven cases (25%), re-ablations for astigmatism correction were needed. In the monotoric group, average postoperative cylinder was 1.89 +/- 0,39 D, and sphere was 0.77 +/- 0.28 D. In eight cases (44%), retreatments were planned.
Bitoric ablations for astigmatic corrections resulted in a decreased frequency of reablation as compared to standard monotoric procedures.
