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We are conveniently located in the South Park Center (the former AT&T/ Transamerica Center)

We are conveniently located in the South Park Center
(the former AT&T/ Transamerica Center)

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We are conveniently located in the South Park Center (the former AT&T/ Transamerica Center)
Call 213-749-3461 to schedule an eye exam
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Home » Eye Care Services » Your Eye Health » How the Eye Works

How the Eye Works

To understand how the human eye works, first imagine a photographic camera—since cameras were developed very much with the human eye in mind.

eye diagramHow do we see what we see?

Light reflects off of objects and enters the eyeball through a transparent layer of tissue at the front of the eye called the cornea. The cornea accepts widely divergent light rays and bends them through the pupil—the dark opening in the center of the colored portion of the eye.

The pupil appears to expand or contract automatically based on the intensity of the light entering the eye. In truth, this action is controlled by the iris—a ring of muscles within the colored portion of the eye that adjusts the pupil opening based on the intensity of light. (So when a pupil appears to expand or contract, it is actually the iris doing its job.)

The adjusted light passes through the lens of the eye. Located behind the pupil, the lens automatically adjusts the path of the light and brings it into sharp focus onto the receiving area at back of the eye—the retina.

An amazing membrane full of photoreceptors (a.k.a. the “rods and cones”), the retina converts the light rays into electrical impulses. These then travel through the optic nerve at the back of the eye to the brain, where an image is finally perceived.

A delicate system, subject to flaws.

It’s easy to see that a slight alteration in any aspect of how the human eye works—the shape of the eyeball, the cornea’s health, lens shape and curvature, retina problems—can cause the eye to produce fuzzy or blurred vision. That is why many people need vision correction. Eyeglasses and contact lenses help the light focus images correctly on the retina and allow people to see clearly.

In effect, a lens is put in front of the eye to make up for any deficiencies in the complex vision process.

The main parts of the human eye include:

  • Cornea: transparent tissue covering the front of the eye that lets light travel through
  • Iris: a ring of muscles in the colored part of the eye that controls the size of the pupil
  • Pupil: an opening in the center of the iris that changes size to control how much light is entering the eye.
  • Sclera: the white part of the eye that is composed of fibrous tissue that protects the inner workings of the eye
  • Lens: located directly behind the pupil, it focuses light rays onto the retina
  • Retina: membrane at the back of the eye that changes light into nerve signals
  • Rods and cones: special cells used by the retina to process light
  • Fovea: a tiny spot in the center of the retina that contains only cone cells. It allows us to see things sharply.
  • Optic Nerve: a bundle of nerve fibers that carries messages from the eyes to the brain
  • Macula: a small and highly sensitive part of the retina responsible for central vision, which allows a person to see shapes, colors, and details clearly and sharply.

 

Special thanks to the EyeGlass Guide, for informational material that aided in the creation of this website. Visit the EyeGlass Guide today!

COVID-19 (coronavirus)

As the facts and situation around COVID-19 (coronavirus) continue to evolve, and in compliance with the recommendations by the CDC, our practice is suspending non-essential or non-urgent eye care effective immediately until further notice.

We believe by taking these extraordinary precautions along with other health care facilities, collectively we can make a difference in helping control the spread of the COVID-19 virus. We recognize the gravity of these extreme measures and remain sensitive to your eye care priorities.

We will be available by phone, voicemail, text and email on a limited basis.We understand that some of you may have eyeglass and/or contact lens orders to pick up.  We will be able to ship these orders to you at your request.

We encourage you to wear your eyeglasses as much as possible especially if your contact lens supply is running low or if you are in need of contact lenses you may visit our online store at http://www.yourlens.com/ceciliaperezod to place an order.  As a courtesy to our loyal patients, we will extend contact lens prescription for 2 months and ship them to you at no charge. In the meantime, please do not over wear your contact lenses for your own safety. Lately there has been misleading information in the press, regarding the use of contact lenses during the COVID-19 spread.  The American Academy of Optometry released this statement regarding contact lens wear: To prevent contact lens infections of all kinds: bacterial, viral, and fungal, contact lens wearers must:

  1. Wash hands thoroughly, at least 20 seconds, with soap and water, and dry hands completely.
  2. Use daily disposable contact lenses if possible.
  3. If solutions are required, use them appropriately. Specifically, do not re-use solutions.
  4. Replace cases monthly or more frequently. Rinse, wipe, and air dry contact lens cases every day.
  5. Do not wear contact lenses when you are ill.

If you have a medical eye emergency ​please call 911 or go to the nearest urgent care facility.Thank you for your trust and understanding during these challenging times.  We always appreciate your loyalty and support!

Stay safe and healthy.

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We will be available by phone, text and email on a limited basis.

Email: cperezoptometry@yahoo.com

Call and text: (213)749-3461

From March 20th through March 30th or until further notice.

We apologize for any inconvenience.

Thank you.

Need contacts? please visit our online web store:

http://www.yourlens.com/ceciliaperezod