Almost all cases of papilledema are bilateral (affect both eyes).
example of these rhythms in both humans and animals is the circadian rhythms which occur every once a day.
It can occur more than once.
A binocle is a dioptric telescope fitted with two tubes joining, to enable to viewing of an object with both eyes at once.
Having two eyes., Pertaining to both eyes; employing both eyes at once; as, binocular vision., Adapted to the use of both eyes; as, a binocular microscope or telescope., A binocular glass, whether opera glass, telescope, or microscope.
You are focusing on the sights and not the target.
They remain eyes once they open!!
The frequency of earthquakes depends on the location. in Japan, earthquakes occur 3 times a month, and in the Sahara in Africa they occur once in five years..
About once a month
once
Locust do not have simple eyes. They have compound eyes that allow them to look in different directions at once.
by blinking and cleaning your eyes with a cloth every once and a while.
They open there eyes once born . Good luck