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How Do We See?

eyeball drawing

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.

ATTENTION:  EFFECTIVE IMMEDIATELY

The Murrysville office will remain closed to 4/1. All services offered through the Greensburg office.

Due to recent recommendations of the CDC, we would like to offer the following check-in procedure:

Thank you for your understanding and help in keeping everyone healthy so we can continue to provide care to our patients.

Doctors and Staff at Eyecare Greengate

COVID-19 ADJUSTED OFFICE HOURS GREENSBURG:

FRIDAY 3/20/2020 11-1PM
SATURDAY 3/21/2020 CLOSED
SUNDAY 3/22/2020 CLOSED
MONDAY 3/23/2020 12-4 PM
TUESDAY 3/24/2020 12-4 PM
WEDNESDAY 3/25/2020 12-4 PM
THURSDAY 3/26/2020 12-4 PM
FRIDAY 3/27/2020 11-1PM
SATURDAY 3/28/2020 CLOSED
SUNDAY 3/29/2020 CLOSED
MONDAY 3/30/2020 12-4 PM
TUESDAY 3/31/2020 12-4 PM

If you are having an emergency, call 724-836-0802and hit option 5

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Thank you for being a valued patient of Eyecare Greengate.

The Murrysville office will remain closed to 4/1. All services offered through Greensburg office.

The safety and well-being of our patients and employees is always our top priority.

We understand that the current coronavirus (COVID-19) is unnerving to all. We are closely monitoring the information from the experts at the Centers for Disease Control (CDC) and the World Health Organization (WHO). As a result, we are adopting recommendations by these organizations, and doing everything possible to mitigate the risk of developing any kind of illness while you are visiting our office.

We will continue to provide our services as currently scheduled. We are asking both our staff and our patients to communicate with us if you are experiencing any flu-like symptoms such as fever, cough, or difficulty breathing. Also, please let us know, if you have traveled to areas where the virus is known to be present. We will be more than happy to help you get your appointment rescheduled for a few weeks from now.

What we are doing:

 

What you can do:

 

COVID-19 ADJUSTED OFFICE HOURS GREENSBURG:

FRIDAY 3/20/2020 11-1PM

SATURDAY 3/21/2020 CLOSED

SUNDAY 3/22/2020 CLOSED

MONDAY 3/23/2020 12-4PM

TUESDAY 3/24/2020 12-4PM

WEDNESDAY 3/25/2020 12-4PM

THURSDAY 3/26/2020 12-4PM

FRIDAY 3/27/2020 11-1PM

SATURDAY 3/28/2020 CLOSED

SUNDAY 3/29/2020 CLOSED

MONDAY 3/30/2020 12-4PM

TUESDAY 3/31/2020 12-4PM

If you are having an emergency, call 724-836-0802 and hit option 5.

Thank you and be well!