205K views · 844 reactions | 「終於勇敢了」的正式版MV你們看了嗎？...

| Explore | Learn | Facts | on Instagram: "Your eyes start drying out just seconds after you stop blinking. This footage shows a tear break-up time test, where a harmless fluorescent dye makes the tear film visible as it spreads across the eye and then slowly evaporates. That thin layer of moisture is essential. It keeps vision clear, protects the surface of the eye, and prevents irritation. Every blink resets the system by spreading a fresh tear film across the cornea. When the tear layer break

Dr. Stefano Russo on Instagram: "Tear Film instability measured with Fluoresceina BUT Fluorescein BUT: The tear break-up time test is easily and quickly performed via fluorescein dye instillation. After the fluorescein is instilled, the patient is asked to stare without blinking. The cornea is observed under the cobalt blue light and time is counted in seconds, from the time of the last blink until a pocket of cornea appears that is no longer covered with fluorescein stained tears. The longer th