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Lancaster, PA 17602
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Home » 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.

How do we see what we see?

eye diagramLight 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!

Dear Patients,

We will be reopening our office Monday, May 18, 2020, and would like to bring you up to date with the many very important physical and procedural changes we have made to our office to assure the highest level of health and safety for our patients and staff during these very challenging times.

We have consulted with our county, state and federal officials, as well as the CDC and other healthcare professionals, to incorporate the recommended and required safety measures throughout our office.

We sincerely apologize for any inconvenience we may have caused by rescheduling or postponing your earlier appointments.

To assure the health and safety of our staff and patients, as well as minimize any exposure, we have instituted the following changes. Please read through this entire document and print a copy so you are familiar with them.

1. Any and ALL appointments and visits will need to be scheduled. This includes the pickup of eyeglasses or trial contact lenses, frame selection, eyeglass repairs, and eyeglass adjustments.

2. Contact lenses will be shipped to all patients at no charge

3. To maintain social distancing and minimize any possible exposure, we have spread out our patient schedule.

4. 24-48 hours before your appointment, one of our staff will be calling to remind you of your appointment and discuss your ocular and medical history. In addition, they will ask you standard COVID19 screening questions and answer any questions regarding your upcoming exam. This will take 5 – 10 minutes but this initial call is important to allow you ample time in our office.

Please look for and answer this call.

5. In order to save time and keep everyone on schedule, any and all medications you are taking should be listed in as much detail as possible on a separate piece of paper, emailed to our secure site: DROXENBERG@COMCAST.NET, or entered on the patient registration form on our website: WWW.DROXENBERG.COM. This needs to be completed prior to your appointment and should include all systemic medications (diabetes, hypertension, etc.) and ocular medications (eye drops, glaucoma medicine, etc.).

6. On the day of your appointment please plan to arrive 15 minutes early and call us at (717) 394-3798 when you arrive. We will return your call when you will be allowed to enter. Entry will be through the front door only unless previously discussed with our staff. Only the person with the appointment will be allowed in the office with the exception of minor children who have the appointment. NOTE: Family members and/or friends will need to wait outside.

7. We will be taking your temperature in the vestibule and anyone with a temperature of 100 degrees or higher or who is sick will be rescheduled. If you feel ill, please reschedule your appointment.

8. All staff will have their temperatures checked 2 times daily for your safety.

9. All staff will wear a facemask while in the office. In addition, all patients must wear a facemask while in the office as mandated by Governor Wolf for all PA businesses. If you do not wear a facemask, one will be provided to you.

10. There are hand sanitizing stations strategically placed throughout the office. Please use them.

11. All frames will be disinfected before and after being handled by patients and staff. Frames will not be returned to the frame display until they are appropriately disinfected.

12. All exam room equipment will be cleaned and disinfected before and after each use according to the CDC guidelines.

13. Cleaning and disinfection of our office have always been a priority and this will continue in earnest.

14. Preferred payment is by credit card or checks at the time of services but cash will be accepted.

15. We have installed a plexiglass barrier on our front desk to comply with the CDC and state guidance.

16. Reception area chairs have been separated to maintain social distancing.

17. Patients who are physically disabled will be allowed entry through the rear door, with prior approval, following a temperature check and COVID19 screening. All other patients must enter through the front door and screening vestibule.

18. Above all else, your safety and health are our top priorities. We take this responsibility very seriously and have implemented these changes in procedures to achieve this.

Dr. Oxenberg has been providing eye care to you and your family since 1990 and expects to continue for many years to come.

If you have any questions and /or concerns, please feel free to email our office at droxenberg@comcast.net or call (717) 394-3798.

We look forward to seeing you all again!

Sincerely,

Dr. Larry Oxenberg