What is the difference between lens and pupil

This creates an abnormal curvature of the eye that can cause blurred vision, glare problems, light sensitivity, and even extreme pain.

Aqueous humor is a clear, watery fluid, contained in two chambers behind the cornea, that helps to bring nutrients to the eye tissues. It is produced by the ciliary body , a ring of tissue that sits behind the iris. As it circulates, the aqueous fluid flows to the front part of the eye, where it is drained by the trabecular meshwork , a sponge-like filtering system located where the cornea and iris meet.

After draining through the trabecular meshwork, the aqueous fluid then passes through a small duct, called the canal of Schlemm , and is absorbed into the bloodstream. The health of your eye depends upon a continuous process of production, flow, and drainage of this aqueous fluid. Any interruption of this process can lead to problems with increased pressure inside the eye, such as glaucoma. The sclera is a tough white outer coating of fibrous tissue that covers your entire eyeball all the way around except for the cornea.

The muscles that move the eye are attached to the sclera. The iris is a ring-shaped membrane inside the eye that surrounds an opening in the center, called the pupil. The iris contains muscles that allow the pupil to become larger open up or dilate and smaller close up or constrict. The iris regulates the amount of light that enters your eye by adjusting the size of the pupil opening.

In bright light, the iris closes or constricts and makes the pupil opening smaller to restrict the amount of light that enters your eye. In dim light, the iris opens or dilates and makes the pupil opening larger to increase the amount of light that enters your eye:. By admin. In News. PUPIL: The pupil is the round, black circle in the center of the iris and is actually a hole through which light passes to the retina.

Leave a Comment. Save my name, email, and website in this browser for the next time I comment. The lens is located behind the iris and is normally clear.

Light passes through the pupil to the lens. Small muscles attached to the lens can make the lens change shape, allowing the eyes to focus on near or far objects. Author: Healthwise Staff. This information does not replace the advice of a doctor.

Sarah C. Feb 10, Together they work to send visual information to the brain. Explanation: Cornea This is the front part of the tough outer coat that is transparent. Focuses the light onto the retina the light sensitive part of the eye , Retina The lining of the back of the eye containing two types of photoreceptor cells - Rods sensitive to dim light, black and white and Cones sensitive to colour.

So, in order of how we see, here are their roles. I hope this helps, let me know if I can do anything else:.