3 doctors weighed in:
What are the functions of the optic nerve, the retina, the iris, the cornea, and the pupil?
3 doctors weighed in

Dr. Joseph Fishkin
Ophthalmology
2 doctors agree
In brief: The visual pathway
Light passes through the cornea, which is the front "windshield" of the eye and helps focus the light.
The iris works as a muscle to increase or decrease the size of the pupil; this controls how much light comes into the eye. Light hits the retina, which converts the light into signals which are sent, via the optic nerve, to your brain.

In brief: The visual pathway
Light passes through the cornea, which is the front "windshield" of the eye and helps focus the light.
The iris works as a muscle to increase or decrease the size of the pupil; this controls how much light comes into the eye. Light hits the retina, which converts the light into signals which are sent, via the optic nerve, to your brain.
Dr. Joseph Fishkin
Dr. Joseph Fishkin
Thank
Get help from a real doctor now
Dr. Bennett Machanic
Board Certified, Neurology
48 years in practice
55M people helped
Continue
107,000 doctors available
Read more answers from doctors