Causative factors for hyperopia regression in excimer keratorefractive surgery

Регресът и хипокорекцията са специфични усложнения в кераторефрактивната хирургия, които трудно се диференцират, пряко зависят от роговичната биомеханика и обуславят икономически значима тенденция към повторна корекция. Научен интерес буди въпросът кои са и от какво естество са факторите, предразполагащи към неочаквани или нетрайни рефрактивни резултати. Не по-малко важен въпрос е дали регресът е хирургична усложнение или само проблем на селекцията на пациенти, на избора на неподходяща процедура или на лазерна платформа. Настоящото изследване предлага напълно нов подход в измерването на регpеса, както и статистически обосновани резултати по отношение на възможните причини за него.Regression and hypocorrection are specific complications in refractive surgery that frequently lead to unexpected or perishable refractive results. They develop due to unforeseen alteration in corneal biomechanics and are hard to differentiate and presume. Their ethiology and pathogenesis are still vague and no statistical evidence on predisposing factors is present. Once more familiar, the regression might be controlled by patient selection, procedure planning or laser platform opting. This study offers a completely new approach to the measurement of regression and statistically sound results in terms of the possible reasons and biomarkers

Regression after Laser Correction of Hyperopia

Purpose: to analyse causative factors for regress in hyperopic laser vision correction. Materials and methods: Metaanalysis of the literature and retrospective analysis of 20 consecutive cases of recorrection at the St. Petka Eye Clinic Varna in the last year. Correlation with pre- and post- operative Kmax, pachimetry (center/periphery), nuclear sclerosis and dysfunctional lens syndrome, total ablation zone, optical zone, cycloplegic refraction, target refraction, age of the patient was done. Re-correction was done with re-lift in 18 of the patients and with re-cut in two of them. Results: Small optical and total ablation zone showed positive correlation with hyperopic regress, while flap diameter correlates as far it is linked to the total ablation zone. Positive correlation was found in thin corneas and in patients over 50 years of age. Discussion: Based on the analysis of the results, recommendations for operative protocol was elaborated in order to minimize the risk for regression post hyperopic LASIK