Application of the Hering's law in corrective surgery for asymmetric bilateral ptosis

Abstract

Objective To evaluate the clinical result of Hering's law in the correction of asymmetric bilateral ptosis. Methods From January 2014 to July 2016, 165 cases divided into 2 groups with asymmetric bilateral ptosis in mild and moderate ptosis were corrected with aponeurosis advancement type correction: A group of 15 cases, in which the surgery does not consider the influence of Hering's law, the first correction of mild side, and then corrected the heavier side; B group of 150 cases, in which the Hering's law was applied, the first correction of severe side so that the margin reached the edge of the cornea is tangent or low 0.5-1.0 mm, and then corrected mild side. That the difference of symmetry between the two sides of the palpebral fissure was less than 0.5 mm, and the follow-up was more than 3 months. The Pearson chi square test was used to compare the differences between the two groups. Results In this group, 165 cases were followed up for 3-24 months, 10 cases (66.67%) was satisfactory in group A (15 cases); 145 cases (96.67%) was satisfactory in group B (150 cases); After 3 months, all the failure cases got satisfactory result by using the Hering's law in corrective surgery again. The P value of chi square test between groups was less than 0.05. Conclusions The application of Hering's law in the correction of asymmetry bilateral ptosis is more satisfactory. Key words: Hering's law; Asymmetry bilateral ptosis; Levator palpebrae superioris muscle