The opening in the eye which allows light to pass through is called the pupil.
pupil
The iris has an opening, called the pupil, through which light enters the eye.
crack,hole or door
Burr hole
Retina- light image is focused on the retina, and it contains the photosensitive receptor cells Pupil- the opening of the eye. The size of the opening is regulated by the iris Iris- pigmented part of the eye (gives people their eye color). The iris is composed of smooth muscle and controlled by reflex.
The opaque middle layer of the eyeball is referred to as the choroid. The structure is made up of a total of four layers.
The iris has an opening, called the pupil, through which light enters the eye.
The hole in a needle is called an eye. The eye of the needle is where you pull the thread through.a hole
crack,hole or door
the eye
the eye
It is called the eye of the needle
Eye
....you answered your own question - it's called "threading a needle".
It is called the eye of the needle
Burr hole
This hole is called as lower punctum. That means such hole is present on your upper eye lid also. Through these holes, water (tear) from your eye goes to your nose. There is one duct for this purpose. This duct is called as nasolacrimal duct.
Yes that's why it is sometimes called the urethral opening