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. It is common knowledge that positive response to phenylephrine (PE) test remains the main indication for superior tarsal muscle (STM) resection for mild and moderate blepharoptosis. However, in recent times, there have been reports about possibility of STM resection in patients with weakly positive and negative responses to the PE test. However, the question remains open what a surgeon should focus on when planning STM resection in these cases? Authors have developed a test for assessing motility of the white line that could help to answer this question. Materials and methods. 75 patients (103 eyelids) operated for blepharoptosis with STM resection in Saint Petersburg City Hospital No. 2 from November 2017 until august 2019 were enrolled in the study. Results. We found no significant correlation between the result of white line motility test in patients with positive response to PE test and the effect of surgery, while in patients with week and negative PE test results there was a strong correlation. Conclusion. The white line motility test could help to assess the desired amount of STM resection in patients with week and negative phenylephrine test results.

White line motility test in transconjunctival muellerectomy for blepharoptosis