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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.

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CORONAVIRUS (COVID-19) UPDATE – MARCH 23, 2020

PLEASE CALL 603-524–5770 BEFORE COMING TO OUR OFFICE.

We are all very concerned with the responsibilities that the coronavirus has placed upon us in recent weeks. We strive our best to maintain the health and well-being of both our patients and our staff. We are all familiar with the CDC guidelines of social distancing, hand washing, hand sanitizers and staying home as much as possible. We are busy at our office disinfecting surfaces between patient visits and completely at the end of each day.

In order to maintain best practice guidelines, beginning March 23, 2020 our office will remain open, with reduced hours from 9:00AM to 1:00PM Monday through Friday. Daily appointments will be reserved for emergencies,urgent care and essential services only, to relieve the burden on the ER and urgent care clinics. Routine eye care services will be rescheduled to future dates. We will be open for delivery of eyeglasses, contact lenses, vitamin supplements,etc.

If you have an eye emergency and need an appointment, please call ahead with your insurance information available so we may verify it before you arrive. If you are picking up glasses, contact lenses, etc. please call ahead to schedule a time for delivery.

If you are sick, have flu-like symptoms or have been exposed to anyone havingCOVID-19, please call ahead to let us know your circumstances so we may help determine the best course of action.

Winnipesaukee Eye is here to serve the community in this time of need. Medical eye care emergencies don’t take a vacation just because we are experiencing this pandemic. Smart precautionary practices and cooperation will allow us to provide a much needed service while supporting a safe and healthy visit.

PLEASE CALL 603-524-5770 TO LET US KNOW YOU ARE COMING PRIORTO YOUR VISIT.

Thank you.

Doctors McManus and the Zagroba, and the Winnipesaukee Eye Staff.