Eligibility criteria and the sample
diplopia, ptosis, allergy, pain, forehead muscle, allergies
DIPLOPIA, PTOSIS, ALLERGY, EYELID PTOSIS, ALLERGIES, NEUROMUSCULAR DISORDER
Included were all patients who had indications for BTX-A injection in the forehead area and had been referred to BouAli Hospital, Tehran, and a private clinic at the time of the examination and who did not have a previous history of an unpleasant postinjection issue. Each person needed to have symmetric mimetic forehead muscle function. Patients with any history of allergy to botulinum toxin type A or lidocaine as well as any history of a neuromuscular disorder would be excluded. Initially, after filling out the file for patients and taking a medical history, all patients with a previous unpleasant history (including allergies) and all patients with asymmetry in injection sites, eyelid ptosis, and diplopia were excluded.Diagnosis of diplopia was made according to the patient’s statements; asymmetry and ptosis were diagnosed via observation by a specialist physician. Only patients with full data were included; in other words, if a patient would not attend the follow-up session 2 weeks after the injection, the recorded pain score would be discarded as well. The patients lost to follow-up would be replaced by new patients in order to reach the desired sample size.