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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.

Protecting our Patients from Coronavirus

Making sure our patients and staff are safe is our top priority.

While the risk of getting the COVID-19 in the US is currently low, we know many patients are concerned about the spread of Coronavirus.

Protocols we already practice as healthcare professionals are some of the best ways to prevent the transmission of the virus.

If you have recently traveled outside of the US, or have had close contact with someone who has, or if you have a fever, cough or other symptoms of acute respiratory distress, please call our office to reschedule your visit. Many of our patients are children and elderly and have unique risks if they are exposed to COVID-19.

Thank you for helping us to protect all of our patients.

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With the day to day changes surrounding COVID-19, we do not know how much longer we will be open to the public. With that being said if you are a contact lens wearer and currently have less than a 3 month supply left, we highly recommend that you place an order now. We will ship them directly to you at no charge.

We will extend contact lens prescription expiration dates on a case by case basis.

Call/text 512-916-4600 or email info@freedom-eyecare.com to place your order.

Dr. Azadi is available for Telehealth Virtual consults so please feel free to contact us via text, phone, or email.

Sending well wishes to you all,

Freedom Eye Care