Analysis of Spontaneous Eyelid Blink Dynamics Using a 240 Frames per Second Smartphone Camera

Area of Science:

• Ophthalmology and Vision Science
• Biomedical Engineering
• Medical Imaging Technology

Background:

• Eyelid dynamics analysis is crucial for diagnosing and monitoring various ocular conditions.
• Traditional videographic methods can be expensive and require specialized equipment.
• Smartphone technology offers a potential low-cost, accessible alternative for clinical measurements.

Purpose of the Study:

• To evaluate the feasibility of using native smartphone cameras at 240 frames per second (fps) for 2D videographic analysis of eyelid dynamics during spontaneous blinking.
• To assess the resolution and clarity of smartphone videography for capturing detailed blink parameters.

Main Methods:

• Prospective recording of spontaneous blinking in 10 healthy volunteers using a smartphone camera at 240 fps and 720p resolution.
• Standardized recording setup with the smartphone on a tripod at 0.5m distance, subjects viewing a nature documentary.
• Exclusion of participants with eyelid malposition, ocular surface pathology, or prior ocular surgery.
• Primary outcome measures included interblink interval, blink rate, percentage of incomplete blinks, and blink velocity.

Main Results:

• The study included 10 subjects (5 male, 5 female, average age 34).
• Mean interblink interval was 7.4 seconds, mean blink rate was 13 blinks/minute.
• Mean percentage of incomplete blinks was 49.8%, and mean blink closure velocity was 93 mm/second.
• Obtained parameters were consistent with previously published data.

Conclusions:

• Native smartphone cameras at 240 fps provide sufficient resolution and clarity for analyzing spontaneous eyelid blink dynamics.
• This technology can yield objective clinical information regarding blink rate, dynamics, and function.
• Smartphone videography presents a promising, accessible tool for ophthalmic assessments.