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How Do We See?

Have you ever thought about how vision works? Seeing is an incredible gift made possible by a system in which the eye and the brain process visual information from the outside world. If any step of that process does not function properly, vision will be impaired.

Similar to a camera, the eye transmits light from the world around us into an image that we can perceive. Certain parts of the eye even function like the different parts of a camera such as the shutter, the lens and film (if we can hearken back to the days when we used film in cameras). Here is a quick breakdown of the fascinating way our eyes and brain enable us to see and experience the world around us:

The Vision Process

Light reflected from an object in our field of view is gathered by the cornea which is essentially the clear “window” to our eye. The cornea then refracts the light rays through the pupil (the center of the iris where light enters the eye). The iris, which like the shutter of a camera will enlarge and shrink based on how much light is coming in, then passes the image onto the crystalline lens. Just like a camera lens, the lens in the eye focuses the light rays, projecting them to a point at the back of the eye called the retina, where the image will appear upside down. The retina contains a thin layer of color-sensitive cells called rods and cones that perceive color.

From the retina, the visual signals travel to the brain via the optic nerve. The brain receives information from both eyes and must then converge the images (and flip them right side up) to get a complete picture.

Vision Problems

A breakdown in vision can happen at any point in this process. From the muscles that control the eyes, to the parts within the eye, to the pathway to the brain. Sometimes vision impairment is due to technical problems with the eye receiving the information and passing the signal on, such as convergence insufficiency (inability to coordinate the eyes to converge on one point), myopia (nearsightedness) or cataracts (clouding of the lens).

Other times, the eyes might work perfectly, but there is a problem with the brain interpreting the signals it receives. In these cases we can’t “see” in the traditional sense, because our brains aren’t able to properly “read’ the signals or we don’t know what we are looking at. This is the case for some learning disorders that are caused by the visual processes in the brain such as dyslexia.

As you can see, vision is quite a complicated process. A simple vision exam isn’t always able to determine vision problems, especially in children which is why it is so important to have regular comprehensive eye exams, to measure the health of the eye and all of its parts.

In an effort to further protect our patients and staff, we are taking the following precautions at our office:

When you arrive in the office for your appointment:

  1. The door will remain locked and open only for patients that have been initially screened
  2. Careful Screening:  All persons entering the office will be screened for symptoms of COVID-19 by 1) being asked a series of screening questions and 2) their temperature will be taken before entering the office.  If the patient's temperature is greater or equal to 100.4 degrees F (38 degrees C), that person will be denied entrance and asked to see their primary care physician.
  3. No additional family, friends, etc will be allowed to accompany the patient into the office
    1. *Exception: children and others requiring assistance - 1 single parent or accompanied guardian allowed
  4. We ask that you please wear cloth or medical MASKS when entering our office. A mask will be required for entry through the door.
  5.  We will be implementing a *$50 “No Show Fee”* for no shows or cancellations if we are not notified at least 24 hours prior to your scheduled appointment.

Safety and Sanitization Precautions:

Frame Selections, Adjustments, Repairs and Dispensing:

 

Although there may be some changes to your normal visit to our office, we assure you that we are doing our best to follow all CDC, California Department of Public Health, California Optometric Association and local public health guidelines to keep our patients, staff and community safe without compromising our standard of excellence and quality during this time.

We ask that you all are mindful of the following precautions. We are all in this together. We look forward to SEEing you all soon!

Aloha Family Optometric Team