The Eye Muscles

February 7th, 2010
 
By Dr. David Christensen

Eye Trivia:

Good eye muscle skills are a critical part of having good vision.  Eye muscles work as a team to help us track moving objects as well as fixate on still targets. They help us in nearly every task throughout the day; tasks such as reading, driving, watching TV, or pouring a cup of coffee.

Did You Know?  Eye movement is controlled by SIX different muscles!  Eye muscles controlling movement are located behind the eye.  You won’t see them looking in the mirror.  Each muscle is attached to the globe of the eye on one end and to the bony orbit at its opposite end.

The Eye Muscles

The Eye Muscles

 

The eye muscle names:

  • Superior Rectus
  • Inferior Rectus
  • Lateral Rectus
  • Medial Rectus
  • Superior Oblique
  • Inferior Oblique

 

As you may already know, muscles shorten when they are stimulated to contract.  Therefore it makes sense that the superior rectus moves the eye upward.  The inferior rectus moves the eye downward, the medial and lateral recti move the eye in and out, respectively.  The superior and inferior oblique muscles help the rectus muscles and allow for torsional rotation of the eye.

If you or your child has a problem with the eye muscles in any way will limit visual function and can lead to many problems, including double vision and poor binocularity.  Assessment of the eye muscles is included with examination at Iowa EyeCare.

Contact us in Marion, Robins, or Cedar Rapids, Iowa, for an appointment.

If you have a question about eyes or vision, leave a comment

Coffee Culture

January 31st, 2010

By Dr. Ryan Nelson

small_cup_of_coffee

Since attending professional school at Southern College of Optometry in Memphis, Tennessee, I’ve been a heavy coffee drinker.   I still think about cramming for a test with my classmates every time I walk into a coffee shop.  The latte and the expresso have been introduced to every street corner in America (Yes, even in Iowa) and most of us are guilty of buying a mocha-choka-somethin’ at one time or another.  I thought you’d like to know how all this coffee and caffeine might be affecting your eyes and vision. 

Phisiologically, when caffiene is consumed it stimulates our central nervous system (our brain).  Because of these direct  affects on the brain, caffeine is  known to cause blurred vision as well as eyelid twiching or ”eyelid myokymia”.  Although caffeine is a psychoactive stimulant drug, it is considered a safe food substance by the United States Food and Drug Administration.

Caffiene is an ingredient in some prescription pain medications.  It has also been included in oral diet supplements.  Don’t forget that prescription medications are regulated by the United States FDA, diet suppenemnts are not.  For those who regularly consume high amounts of caffeine can expect to have withdrawl symptoms, which may include headache, irritability, drowsyness, and upset stomach.  I think most physicians would agree with me that moderation is the key.

After doing some additional research on wikapedia I discovered that caffiene is found naturally in coffee plants where it acts as a pesticide.  Now there’s some food for thought!

Do not dispair coffee drinkers.   There are plenty of benefits to consider including lowering your risk of colon cancer, Parkinsons, and diabetes.  Caffeine may also help prevent cavities and temporarily boost your athletic ability.

Do you have dry eyes? Your not alone, Dry Eye Syndrome affects an estimated 3.23 million women and 1.68 million men in the United States each year. Did you know that caffeine may help relieve dry eye symptoms?  More research needs to be done, surely, but an article from Review of Ophthalmology in September, 2000, reported that those who drink coffee are 25% less likely to experience dry eye.  Learn more about Dry Eye on the Iowa EyeCare website.

To schedule an eye exam with an eye doctor at Iowa EyeCare call 319-377-2222 or Schedule an appointment online.  Iowa EyeCare has locations in Marion, Cedar Rapids, and Robins, Iowa.

Dry Eye & Artificial Tears

January 24th, 2010

By Dr. David Christensen

Artificial Tears

Artificial Tears

Most of us experience dry eye from time to time.  Expecially during the Iowa winter months.  Most people experience symptoms either in the car, at work, or at night watching TV or reading a book.  If you go to the local supermarket, you’ll find a whole wall full of eyedrops.  It can be difficult trying to decide which eye drops to buy.  The eye doctors at Iowa EyeCare can help you best manage your dry-eye symptoms.  Sometimes we recommend over-the-counter artificial tears, enviornmental changes, dietary changes, and other times we might decide that a prescription medication or other treatment options are most beneficial.  Multiple treatment modalities are needed because individuals experience dry eye for different reasons. Dry eye may be due to poor lid function, poor aqueous production, poor eye-lipid production, or excessive tear drainage.

Keep in mind that all eyedrops are not created equal.  Lubricating eyedrops that are designed to combat dry eye, do so in different ways.  Before spending your money on an eye drop that may not work for you, schedule an appointment with one of our eye doctors at any of our Robins, Marion, or Cedar Rapids, Iowa, locations.

You can also learn more about Dry Eye on the Iowa EyeCare website.

Obesity and the Eye

January 17th, 2010

 By Dr. Ryan W. Nelson

  
The visual system is vulnerable to the effects of excessive body weight.  Numerous eye conditions are caused by or accelerated as a result of obesity.  Maintaining a healthy body weight will reduce your risk of getting these eye conditions and many others:

A personal decision to make lifestyle changes is the most important step in fighting obesity.  Obesity is often the result of high caloric consumption and low caloric utilization.  It is for this reason that the primary treatment for obesity is to change diet and exercise habits.  Use the food pyramid provided to help you choose the right foods to eat.  The doctors at Iowa EyeCare recommend at lease 30 minutes of moderate-intensity physical activity each day.  Don’t forget to include aerobic and muscle-strengthening exercise in your routine.

Obesity is increased body weight caused by excessive accumulation of fat to the extent that ones health is negatively affected.  Excessive body weight is associated with diabetes type 2, cardiovascular disease, cancer, and many other systemic conditions.  The consequence of obesity is a reduction in life expectancy by almost 7 years and unfortunately new evidence tells us that the prevalence of obesity is rising in both children and adults.
 
Contact Iowa EyeCare now.  We have locations in Cedar Rapids, Marion, and Robins, Iowa.
Food Pyramid

Food Pyramid

Don’t Underestimate the Importance of Sun Protection for Your Eyes

January 10th, 2010
  
 Dr. Kimberly Cruise
 
 You know sun protection is important for your skin.  The eyes need sun protection too.  Even during the Iowa winter months.
 
 Iowa EyeCare strongly recommends all of our patients wear UV eye protection when outdoors, even on cloudy days and even during the Iowa winter.  Limit you time in direct sunlight, wear a wide-brimmed hat, and always wear sunglasses.  Sun protection is especially important in children.  Significant UV damage occurs in children when the eyes are not properly protected from the sun because their eyes do not filter UV as well as adults.

The radiation you receive from the sun is known to cause multiple adverse eye conditions including:

Save Money! If you have insurance that allows you to get new frames, why not make your old glasses into sunglasses?

Get an Eye Exam! The eye doctors at Iowa EyeCare are ready to serve all of your vision care needs.  We are confident that Iowa EyeCare can provide you with the best sunglasses in Iowa.  Contact us today: Iowa EyeCare has locations in Marion, Robins, and Cedar Rapids, Iowa.

 
Iowa Snow
Iowa’s Winter Sun
 
 
 

Rid Yourself of Glasses and Contact Lenses

January 4th, 2010
Iowa LASIK

Iowa LASIK

Laser vision correction has never been more precise or more safe than it is right now at Iowa EyeCare in Robins, Iowa.  We use the best equipment in the world.  We have a world-class LASIK surgeon.  Experience now what thousands of others have already discovered.

Iowa EyeCare has teamed with TLC Laser Eye Centers to provide patients with the very best LASIK experience.  Iowa EyeCare and TLC are committed to quality.  Many patients choose us because of our lifetime guarantee

To learn more about LASIK surgery at Iowa EyeCare schedule a free LASIK consultation with Stacey Lensch, our Laser Vision Coordnator.  Stacey may also be reached by phone at 319-294-8888.

You can also learn more by reading our previous Blog post:

Important Facts To Know About Custom Bladeless LASIK

Eye Care for the Aging Eye

December 28th, 2009

By. Dr. Dennis Francis

Dr. Dennis Francis

Dr. Dennis Francis

It’s a fact of life that your vision changes as you get older. Knowing what to expect and when to seek professional care is important to your visual well-being. Wise lifestyle choices and routine eye examinations can significantly improve your chances for maintaining good eye health as you age.  Developing a healthy lifestyle that includes a proper diet, plenty of exercise, cessation of smoking, cessation of drug use or alcohol, drinking water, getting routine visual and general medical care are all important to your eyes later in life.

Macular Degeneration, Cataracts, Diabetes, and Glaucoma are principal causes of blindness in Iowa and in the United States. Tremendous progress has been made recently in both the diagnosis and treatment of these common diseases. Iowa EyeCare has the best tools in the Cedar Rapids area to combat these conditions. Early intervention can make a difference in your outcome.

Dry Eye is among the most common eye conditions of the aging eye.  Burning, watering, irritating eyes, can cause discomfort and reduce your quality of life.  Iowa EyeCare specializes in finding the right treatment option for the type of dry eye that you have.

Iowa EyeCare always welcomes new patients, both young and old.  Make an appointment to get started now.

 

The Aging Eye

The Aging Eye

 

The Iris: Details of Eye Color

December 20th, 2009

 By Dr. David Christensen

Dr. David Christensen

Dr. David Christensen

The Iris

The Iris

 The colored part of the eye is actually a combination of two muscles collectively called the iris.  The iris functions as a dynamic aperture, allowing only a limited amount of light into the eye.  In dim light the dilator pupillae muscle contracts and the sphincter pupillae muscle relaxes, opening the aperture allowing more light to enter the eye.  In bright light, the opposite is true; the dilator pupillae muscle relaxes and the sphincter pupillae muscle contracts, closing the aperture allowing less light to enter the eye. 

Iris color is a result of pigmentation.  Pigment acts to block light from entering the eye.  The most common colors are brown, blue and green.  Eye color is genetic and is the result of influences from both mother and father, but is not a simple blend of color from both parents.  The genetic influences of eye color are not fully understood.

 

You may not know that eye color can change over time and may a result from several different factors.  Many young children are born with light-colored eyes that gradually become darker during the first few years of their life.  Other eye color changes may be the result of eye disease.  For example, pigmentary glaucoma, Fuch’s heterochromic iridocyclitis, and Horner’s syndrome can all result in changes to eye color.  Furthermore, some medications can alter eye color.  Prostaglandin glaucoma medications have been known to modify eye color over time.  Furthermore, the brilliant colors of youthful eyes can fade and dull over time.  If your eye color changes suddenly, please seek care immediately.  The eye doctors at Iowa EyeCare always welcome new patients.

Contact lenses now give you a choice in your own eye color.  Colored contact lenses are a medical device and require a prescription from an eye doctor.  Never purchase lenses from friends or from a beauty shop.  The damage from contact lens abuse can cause permanent vision loss.  If you are interested in colored contact lenses contact Iowa EyeCare in Marion, Robins, or Cedar Rapids, Iowa, today!

Genetics and Eye Color

Genetics and Eye Color

 

 
 
 
 
 

What does the term “lazy eye” mean?

December 14th, 2009

By Dr. Dennis Francis

_dfrancis

Dr. Dennis Francis

 I often hear patients say they have (or think they have) a lazy eye. The term “lazy eye” is actually synonymous with the medical term “amblyopia”. Amblyopia occurs when one eye fails to provide adequate vision and the brain begins to collect visual information from only the better eye. The poorer seeing eye subsequently fails to develop normally. If left untreated, amblyopia results in a best-corrected vision of worse than 20/20 and reduced binocular vision.

amblyopia

Amblyopia is most often a consequence of unequal glasses prescription between the two eyes or from monocular strabismus (one eye turning in or out). It is very difficult to re-train the brain once it decides not to use the amblyopic eye. Amblyopia is one of the most common causes of vision loss in children because it often arises without symptoms. Routine eye examinations play a key role in preventing vision loss from amblyopia.

The American Optometric Association and the eye doctors at Iowa EyeCare agree that even if no eye or vision problems are apparent, at about age 6 months, you should take your baby to your doctor of optometry for his or her first thorough eye examination. We can offer helpful suggestions to prevent amblyopia and, if necessary, begin treatment for any eye-related problems.

 

Please schedule an appointment with an eye doctor at Iowa EyeCare in Cedar Rapids, Marion, or Robins, Iowa.

Iowa Pheasant Hunting: Vision Tips

December 8th, 2009

By Dr. Ryan W. Nelson

 

rooster phesant

Hunting pheasant in Iowa can be challenging.  For those who have been hunting them for years, you know it’s getting tougher.  Here are some vision tips from an eye doctor that may help you harvest more roosters this year.

1. Yellow and amber tinted lenses can help you identify roosters from hens.

The colors of a rooster pheasent are easier to see when viewing them through a yellow or amber tinited lens.  This becomes even more important in dim light, or on overcast days.  If you have never looked though a quality pair of tinited lenses, now is the time to give it a try. 

2. Single vision lenses will help you maintain a clear shooting target.

Spectacle lenses built specifically for hunting are a must for today’s avid hunter.  Progressive addition bifocals are great for day-to-day wearing, but often have areas in the periphery of the lens that do not provide sharp vision.  Do yourself a favor and select a pair of single-vision distance lenses with a large eye-size.

LASIK surgery may also be the perfect solution.  LASIK may reduce your dependancy on glasses while hunting all together. 

Click here for the best LASIK in Iowa

3. Central vision is best for acuity and identification, peripheral vision is best for detecting movement.

Allow me to get technical for just a minute.  The human visual system can actually be thought of as two systems working together.  The “Where is the bird” system (called magno) and the “What type of bird” system (called parvo).  The magno system alerts us to a visual event and the parvo system identifies the event.  The magno system does not carry information such as color and detail, so that it reaches the brain quickly.  The cells that trigger the magno system are located in the periphery of the eye, those parvo cells responsible for detail are located in the macula (the area lined up with the center of the pupil).

Regular eye exams help detect the diseases that attack these two systems.  Glaucoma affects the magno system and macular degeneration affects the parvo system.  Both glaucoma and macular degeneration can cause blindness if left untreated.  If glaucoma and macular degeneration are caught early, before they start causing problems, you have a much greater chance of hunting pheasant in your golden years. 

4. Stay away from billed caps that limit your visual field.

Finding more birds can be as simple as removing your hat …or finding one without a brim.  You already know that your peripheral vision tells you “Where is the bird”.  The human visual field extends 165 degrees horizontally and 135 degrees vertically.  Compare that with a pheasant who might have more than 270 degrees horizontally and 170 vertically.  A hat with a brim only further limits your range of vision.

5. Shoot with both eyes open.rooster phesant 2

Not only is shooting with both eyes open safer, but it opens up your peripheral vision so that you can identify your next shot quickly.  Spend extra time at the shooting range practicing your aim with both eyes open.

To learn more schedule an eye exam in Cedar Rapids, Marion, or Robins, Iowa.