Eyelid Blink Characteristics in Patients with Ptosis Assessed Using Cellphone Camera before and after Levator Resection

Abstract

Purpose: To compare the eyelid blink characteristics of patients with ptosis assessed using a cellphone camera before and after levator resection.Methods: In this prospective study, pictures and videos of eyelid blinking were obtained from 40 eyes (20 patients with ptosis) at a margin reflex distance 1 (MRD1) of 3.0 mm or less before and 1 month after levator resection. MRD1, palpebral fissure height (PFH), levator function, inter-blink interval, and blink duration, rate, and velocity were measured. The patients were also divided into those aged < 70 or ≥ 70.Results: MRD1, PFH, and blink velocity increased, and blink duration decreased, after levator resection. In the ptosis group aged less than 70 years, the levator function and blink velocity increased preoperatively, while MRD1, PFH, levator function, and blink velocity increased postoperatively. The blink velocity showed a positive correlation with MRD1 and PFH.Conclusions: Although no significant changes were observed in levator function postoperatively, the blink velocity increased significantly. Blink velocity may be useful for the evaluation of ptosis and as an indirect measure of levator function.

Videographic analysis of blink dynamics in patients with chronic progressive external ophthalmoplegia, myogenic ptosis, and facial nerve palsy using smartphone camera: A comparative analysis

“…20 A recent interventional study comparing the eyelid blink characteristics of patients with ptosis assessed using a smartphone camera before and after levator resection reported increased postoperative blink velocity captured by smartphone camera. 21 However, it's worth noting that these studies focused on a restricted number of healthy individuals when analyzing spontaneous eyelid blinking using smartphone imaging. In contrast, our study aimed to delve into these measurements across a spectrum of disorders, namely CMP, FNP, and CPEO, characterized by eyelid movement impairments.…”

“…A recent review on smartphone ophthalmic imaging techniques explored utility of smartphone camera in ophthalmology work‐up from anterior to posterior segments imaging extended in eyelid disorders and strabismology 20 . A recent interventional study comparing the eyelid blink characteristics of patients with ptosis assessed using a smartphone camera before and after levator resection reported increased postoperative blink velocity captured by smartphone camera 21 . However, it's worth noting that these studies focused on a restricted number of healthy individuals when analyzing spontaneous eyelid blinking using smartphone imaging.…”