The normal adult blinks at a rate of 10 to 20 times per minute. This tends to be reduced when reading or using the computer. An increase in lid closure frequency and tone is known as blepharospasm. This is a focal dystonia appearing in adults with recurrent spasms of eye closure; the orbicularis oculi muscle contracts forcibly and involuntarily. This lasts for periods varying from seconds to minutes and often repeatedly.
This is a companion discussion topic for the original article at https://patient.info/doctor/neurology/blepharospasm