to blink
The German word 'blinzeln' is used to describe the action of briefly closing and opening the eyes. It can be used in the same contexts as 'to blink' in English. For example, 'Er blinzelt, um das Sonnenlicht aus seinen Augen zu halten.' translates to 'He blinks to keep the sunlight out of his eyes.'.
He had to blink to bear the bright light
This phrase is used to illustrate someone momentarily closing their eyes (blinking), in this case as a reaction to bright light.
I had to blink to adjust my eyes
This phrase is used when someone blinks to adjust their eyesight, usually because of changes in light. It may imply the person has just entered a new environment with a different lighting condition.
She blinked in surprise
This phrase underlines a physical reaction (blinking) to an emotional state (surprise). Blinking in surprise is a common phrase in English and in this case in German as well.