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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.

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Dr. Inns is a 1982 graduate of the University of Houston College of Optometry. He holds a Bachelor of Science degree from Wilfred Laurier University, Canada. During his training at the University of Houston, he held positions in research and was a teaching assistant / laboratory instructor.

Postgraduate work includes therapeutic courses at Pennsylvania College of Optometry and the Optometric Glaucoma Specialist Course at the University of Texas Medical School. Dr. Inns has published in Optometry Today and Optometric Management. He also volunteers at the schools in his area.

Dr. Inns and his wife, Lynn, spend much of their spare time calling and visiting with their four boys.

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Amber Draper, Manager

As the manager of The Woodlands office, Amber Draper leads the team with the focus on patient care and assisting with their ophthalmic needs. Having over 10 years experience, Amber can aid patients with the most appropriate lens technology to match their daily needs. Everyone needs at least one pair of sun wear, especially here in Texas.

Amber is a proud graduate of Sam Houston State University with a BA in History, and a minor in Spanish.

In her spare time, she is with family, friends, and enjoying some Houston Texans Football.

Dr. Toups is a 1984 graduate of the University of Houston College of Optometry. He has a Bachelor of Science degree in Pharmacy from Northeast Louisiana University.

Being a therapeutically licensed optometrist, Dr. Toups is trained to diagnose and treat ocular conditions. He specializes in contact lenses and he is current with all refractive surgery procedures.

Dr. Toups is married, has five children and has lived in the Houston area since 1980.

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