Excimer laser photorefractive keratectomy is not the regular procedure for young children. However, it can be selectively done in some special cases, such as myopic or/and hyperopic anisometropia, Anisometropic amblyo...Excimer laser photorefractive keratectomy is not the regular procedure for young children. However, it can be selectively done in some special cases, such as myopic or/and hyperopic anisometropia, Anisometropic amblyopia, refractive accommodative esotropia. There were risks and limitations for refractive surgery in the pediatric population. In this article, we reviewed and summarized the indications, principles and complications of excimer laser treatment in pediatric patients. [FK(WB80011。6]展开更多
Objective To investigate the relationship between muscular asthenopia post photorefractive keratectomy (PRK) and eccentric ablation.Methods 16 eyes of 8 myopia cases whose muscular asthenopia was corrected by subjec...Objective To investigate the relationship between muscular asthenopia post photorefractive keratectomy (PRK) and eccentric ablation.Methods 16 eyes of 8 myopia cases whose muscular asthenopia was corrected by subjectively accepted triangular prism after PRK with vision more than 0.8 were followed up for 6-14 months. On the basis of data provided by the pre-PRK, post-PRK and their difference corneal topography, we calculated the real corrected corneal diopter (D) with the Holladay formula and measured the ablating eccentricity (h) and its direction. According to the formula δ≈Dh, the prism effective value (δ) caused by the eccentric ablation was computed and compared with objectively accepted triangular prism.Results The subjectively accepted prism was similar to values calculated from the formula. Their mean difference is 0.10±0.25. The direction of the subjectively accepted prism was in the direction of ablation deviation.Conclusions Eccentric ablation was the chief cause of post-PRK muscular visual asthenopia. The triangular prism effective value from eccentric ablation may be estimated by the formula δ≈Dh. We must pay attention to the diagnosis, treatment and prevention of post-PRK muscular asthenopia.展开更多
文摘Excimer laser photorefractive keratectomy is not the regular procedure for young children. However, it can be selectively done in some special cases, such as myopic or/and hyperopic anisometropia, Anisometropic amblyopia, refractive accommodative esotropia. There were risks and limitations for refractive surgery in the pediatric population. In this article, we reviewed and summarized the indications, principles and complications of excimer laser treatment in pediatric patients. [FK(WB80011。6]
文摘Objective To investigate the relationship between muscular asthenopia post photorefractive keratectomy (PRK) and eccentric ablation.Methods 16 eyes of 8 myopia cases whose muscular asthenopia was corrected by subjectively accepted triangular prism after PRK with vision more than 0.8 were followed up for 6-14 months. On the basis of data provided by the pre-PRK, post-PRK and their difference corneal topography, we calculated the real corrected corneal diopter (D) with the Holladay formula and measured the ablating eccentricity (h) and its direction. According to the formula δ≈Dh, the prism effective value (δ) caused by the eccentric ablation was computed and compared with objectively accepted triangular prism.Results The subjectively accepted prism was similar to values calculated from the formula. Their mean difference is 0.10±0.25. The direction of the subjectively accepted prism was in the direction of ablation deviation.Conclusions Eccentric ablation was the chief cause of post-PRK muscular visual asthenopia. The triangular prism effective value from eccentric ablation may be estimated by the formula δ≈Dh. We must pay attention to the diagnosis, treatment and prevention of post-PRK muscular asthenopia.
