Typically, a human blinks 15 to 20 times per minute though some medical conditions may result in blinking at a rate noticeably outside the normal range. Two major functions of blinking include keeping the eyeballs moist and protecting the eyes from irritants, such as dust.Know More
When an individual looks at a specific object for a long time, the rate of blinking decreases. Reading for an extended period can result in fatigue as the eyes gradually dry.
In 2012, research was published regarding the association between eye blinks and natural gaps in external stimuli, such as the spaces between sentences in written work. Analysis of brain activity during blinking episodes suggests that blinking plays a role in adjusting one's focus and in aiding concentration.Learn more about Vision
Excessive blinking in children can be triggered by problems with the anterior segment or the eyelids, such as eye strain, tics, allergies, dry eyes, refractive error, intermittent exotropia and stress. This condition can affect one or both of the eyes and the blinking may tend to be very forceful. Excessive blinking is also linked to movement of the neck, face and head, as stated by AAPOS.Full Answer >
The normal range for pupil size is between 2 and 5 millimeters, although the lighting plays a large part in that spectrum. As people age, their pupils tend to become smaller, according to About.com.Full Answer >
According to Johns Hopkins, the normal respiration rate for a resting human is 12 to 20 breaths per minute (bpm). This number varies considerably throughout the day, rising during and immediately after periods of intense physical activity and dropping somewhat during sleep.Full Answer >
The heart of a hedgehog beats approximately 190 times per minute. A healthy hedgehog can have a resting heartbeat between 180 and 280 beats per minute.Full Answer >