All about eyes-functions


When we see, we use our eyes and brain together. We see when light enters our eyes from objects we are looking at. Images we are looking at hit the retina at the back of our eyes upside down and back to front. They are then converted into electrical signals and sent to our brain through our optic nerve. From this, our brain can process what we see.

Vision is decreased if any of these parts of the eye are not working as they should.


Tears begin in the lacrimal gland and with every blink the eyelids sweep them across the eye, spreading tears evenly across the surface. The blinking motion of eyelids forces the tears into tiny drains found at the inner corners of the upper and lower eyelids. The tears then travel through canals to something called the lacrimal sac which in turn drains into the nasal passage.



There are six muscles which move the eyes up and down and left to right.


As we blink, tears wash our eyeballs, keeping them moist and clean. We blink about ten times a minute and over 10,000 times a year. The muscle that lets you blink is the fastest muscle in the body.


Our eye is well protected by our eyebrows, eyelashes and eye sockets. Our eyebrows keep sweat and rain out of our eyes. They are arched in shape to re-direct fluid to the sides of our eyes.

Eyelashes help to keep the dust and dirt out.

The eyes are set in part of the skull called the eye sockets. These help to protect your eyes from injury