What are the main parts of the eye and how do they function?

Question

I'm interested in learning everything I can about eyes, but I haven't found anything helpful yet. Does the color of a person's eyes have anything to do with their sight? Do eye colors change over time? If so, why would eye color change? What are the main parts of the eye and what are their functions?

Answer 1

Pupil, it's the opening in the center of the iris. The size of the pupil determines the amount of light that enters the eye. The pupil size is controlled by the dilator and sphincter muscles of the iris. Doctors often evaluate the reaction of pupils to light to determine a person's neurological function.

When you look at an object, light rays are reflected from the object to the cornea, which is where the miracle begins. The light rays are bent, refracted and focused by the cornea, lens, and vitreous. The lens' job is to make sure the rays come to a sharp focus on the retina. The resulting image on the retina is upside-down. Here at the retina, the light rays are converted to electrical impulses which are then transmitted through the optic nerve, to the brain, where the image is translated and perceived in an upright position!

Answer 2

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What are the main parts of the eye and how do they function?
I'm interested in learning everything I can about eyes, but I haven't found anything helpful yet. Does the color of a person's eyes have anything to do with their sight? Do eye colors change over time? If so, why would eye color change? What are the main parts of the eye and what are...

Answer 3

Iris Gives Colour To Our Eyes IRIS:-- This is the colored part of the eye: brown, green, blue, etc. It is a ring of muscle fibers located behind the cornea and in front of the lens. It contracts and expands, opening and closing the pupil, in response to the brightness of surrounding light. Just as the aperture in a camera protects the film from over exposure, the iris of the eye helps protect the sensitive retina.