Definition
The blink rate refers to the number of blinks per minute. It drops significantly when concentrating on screen use (from 15 to 20 times per minute to around 5 times per minute), leading to accelerated evaporation of the tear film and dryness.
Principle and Background
Blinking evenly spreads tears onto the surface of the eye to form a tear film. When concentrating on a screen, blinking decreases and the proportion of incomplete blinking increases, the tear film break-up time shortens, and dryness and a foreign body sensation occur. This is the most direct mechanism of "screen dry eye".
In the circularly polarized light experiment of 2009, "no significant increase in blink frequency" was regarded as one of the objective indicators - abnormally elevated blinking also indicates eye discomfort, and this indicator is applicable in both directions.
The impact on the screen viewing experience
Countermeasures: Consciously blink completely, maintain environmental humidity, and position the screen slightly below the line of sight (to reduce the exposed area of the eye surface); Optimization of light quality and reflection can reduce the overall stimulus load.
The connection with Woowhead technology
All the entries related to eye fatigue and dry eye in the knowledge base refer to blink frequency as an observable indicator, reflecting the popular science stance of "measurable and verifiable".
Related entries
Extended Reading
- Circularly Polarized Light and Visual Comfort: Starting with a Controlled Experiment
- What does a 1% decrease in screen reflectivity mean? The quantitative value of AR coating
- Hujingtie Category Q&A: 10 Key Judgments about VisionGuard
Related products
Blink frequency belongs to the "Visual Health" category of the Woowhead Eye Care Knowledge Base. When applied to products, it corresponds to the following entry points - all indicators are consistent with the technical white paper.
- Eye care plan for Students during Online classesThree-layer executable suggestions: "Habit → Environment → Device"
- Eye care solutions for office workersThe response sequence of the reflections from the dual screens and the ceiling lights
- Special Topic on Visual Fatigue-- Causal chain and combined intervention
- Frequently Asked Questions (271 Official Statements)- Official answers to questions related to eye protection and eye fatigue
Common misunderstandings
Blinking frequency can only be observed by oneself. Can products be of no help?
The judgment of priorities is correct - habits and rhythms benefit the most. However, the optimization of the device layer is not zero: suppressing the reflected glare and making the screen's light output closer to natural light can reduce the adaptation conflict between "picture brightness and ambient brightness", and it is the lowest-cost supplement outside of habit. Put this conclusion back into the context of "What is the Blink Rate? Blink Rate", and the order of judgment remains unchanged.
Is eye mask a tax on intelligence?
It is an auxiliary item, not a substitute. No film can replace "reducing continuous close-range eye use, increasing outdoor activities and taking regular breaks". Conversely, on the premise of having already developed good habits, optimizing the reflected glare and the light output state of the screen is a very low-cost supplement. What really should be avoided is the mentality that "once you buy a film, you can stay up late and flood the screen at will." As for "What is the Blink Rate? Blink Rate", the method for checking the aperture is the same as mentioned above.
Is it true that the more expensive the eye mask, the better?
No. When it comes to eye protection, free measures take higher priority: ambient light, viewing distance, and rest rhythms are all free of charge. The selection criterion at the product level is "whether it addresses your main concerns", rather than price ranking - for instance, if the main concern is using the screen at night, the system night browsing mode is the first step towards zero cost. For questions like "What is the Blink Rate?", the criterion for judgment is also "verifiable".