thru the optic nerves
When a stimulus is received by a sense organ, it gets converted into electrical signals that travel through neurons to the brain. The brain then processes and interprets this information to create a perception of the stimulus, which can then lead to a behavioral response or action.
The eye connects with with the brain via the optic nerve. Inevitably, it is slightly more complicated than that. The retina of the eye does considerable processing of visual information and the eye/visual context can be considered a single system. Interestingly, by accidents of evolution, the retina is "inside out" - the nerves are on the wrong side and the visual cortex is at the back of the brain making the optic nerve much longer than it needs to be.
Pupil is a window for the light to enter our eyes. When we are in a dim light a nerve impulse is generated to the brain to enlarge the pupil. Size of pupil is managed by the iris (coloured part of the eye). If excessive light is there, the pupil shrinks to a smaller size so that the eye's not damaged esp. the retina where the image of objects are formed
When light enters the eye, it passes through the cornea, then the lens, and ultimately reaches the retina at the back of the eye. Here, light triggers a chemical reaction in the cells of the retina called photoreceptors, specifically in rods and cones, which convert the light into electrical impulses that are then transmitted to the brain via the optic nerve.
Light rays reflect off the object and into the eye where they are refracted by the cornea and focussed by the lens on to the retina, the optic nerve then carries the messages to the brain and an image is formed.
The optic nerve
Nerve impulses travel up through nerves, into the spinal cord and into one of the different lobes of the brain depending on where the impulse comes from. For example, if the impulse comes from your ear, the impulse would travel to the temporal lobe.
A nerve impulse can travel in two directions: towards the brain (sensory or afferent pathway) to convey sensory information, and away from the brain (motor or efferent pathway) to control muscle movement or glandular secretion.
It takes about 0.05 seconds approximately!
It 200 miles per hour And it can probally be in meters too.
After passing through a left relay neuron, the impulse would travel to the right side of the brain to be processed in the cerebral cortex. The cerebral cortex is responsible for higher brain functions including sensory perception and motor control.
optic nerve
Nerve impulses travel up through nerves, into the spinal cord and into one of the different lobes of the brain depending on where the impulse comes from. For example, if the impulse comes from your ear, the impulse would travel to the temporal lobe.
A nerve impulse travels from your leg to your brain through sensory neurons. Once in the brain, the impulse is processed, and a response is generated. The response travels back to your leg through motor neurons to initiate movement or action.
the brain
they transfer nerve impulse to the brain which allows brain to function
Messages reach the brain via one of the sensory organ, like nose, eye, ear, tongue or skin. The impulse travel through the most complicated paths to interpret the messages. That should be beyond the capacity of the science to know this, specially in case of human being. You may know the same in case of primates, with the help of some discovery in near or distant future.