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Correction of astigmatism using positive and negative cylinder programs with the Nidek EC-5000 excimer laser
R Molina1, R Monasterio, E Soliz
1Instituto del Ojo Molina, Gabriel Rene Moreno University, Santa Cruz, Bolivia.
Background:
The efficacy of a current program of positive cylinder treatment was evaluated and compared to a previous program of negative cylinder treatment.
Methods:
The authors performed a comparative analysis of 123 eyes (72 patients) who underwent LASIK using the Nidek EC-5000 excimer laser with the formula developed by Chayet and the positive cylinder (71 eyes of 52 patients) and negative cylinder programs (52 eyes of 31 patients).
Results:
A faster stabilization of correction and a marked reduction of stromal tissue ablated were obtained with the positive cylinder program than with the negative cylinder program. This was directly related to the amount of preoperative ametropia.
Conclusion:
The spectrum of ametropias that can be treated with LASIK is increased with the positive cylinder program because less tissue is ablated.