Learning-Related Vision Problems

May 20, 2009

Section: News — Tags: , , — Dr. Curtis @ 2:22 pm

Learning-Related Vision Problems

This article was provided by AllAboutVision.com.  Follow the links below for more information on eye health and vision correction.

There’s no question that good vision is important for learning. Experts say more than 80% of what your child is taught in school is presented to them visually.

To make sure your child has the visual skills they need for school, the first step is to make sure your child has 20/20 eyesight and that any nearsightedness, farsightedness and/or astigmatism is fully corrected with glasses or contact lenses. But there are other, less obvious learning-related vision problems you should know about as well.

Good vision is more than 20/20 visual acuity

Your child can have “20/20” eyesight and still have vision problems that can affect their learning and classroom performance. Visual acuity (how well your child can see letters on a wall chart) is just one aspect of good vision, and it’s not even the most important one. Many nearsighted kids may have trouble seeing the board in class, but they read exceptionally well and excel in school.

Other important visual skills needed for learning include:

  • Eye movement skills – How smoothly and accurately your child can move their eyes across a printed page in a textbook.
  • Eye focusing abilities – How well they can change focus from far to near and back again (for copying information from the board, for example).
  • Eye teaming skills – How well your child’s eyes work together as a synchronized team (to converge for proper eye alignment for reading, for example).
  • Binocular vision skills – How well your child’s eyes can blend visual images from both eyes into a single, three-dimensional image.
  • Visual perceptual skills – How well your child can identify and understand what they see, judge its importance, and associate it with previous visual information stored in their brain.
  • Visual-motor integration – The quality of your child’s eye-hand coordination, which is important not only for sports, but also for legible handwriting and the ability to efficiently copy written information from a book or chalkboard.

Deficiencies in any of these important visual skills can significantly affect your child’s learning ability and school performance.

Many kids have vision problems that affect learning

Many kids have undetected learning-related vision problems. According to the College of Optometrists in Vision Development (COVD), one study indicates 13% of children between the ages of 9 and 13 suffer from moderate to severe convergence insufficiency (an eye teaming problem that can affect reading performance), and as many as one in four school-age children may have at least one learning-related vision problem.

Signs and symptoms of learning-related vision problems

There are many signs and symptoms of learning-related vision disorders, including:

  • Blurred distance or near vision, particularly after reading or other close work
  • Frequent headaches or eye strain
  • Difficulty changing focus from distance to near and back
  • Double vision, especially during or after reading
  • Avoidance of reading
  • Easily distracted when reading
  • Poor reading comprehension
  • Loss of place, repetition, and/or omission of words while reading
  • Letter and word reversals
  • Poor handwriting
  • Hyperactivity or impulsiveness during class
  • Poor overall school performance

If your child exhibits one or more of these signs or symptoms and is having problems in school, call us to schedule a comprehensive children’s vision exam.

Comprehensive children’s vision exam

A comprehensive children’s vision exam includes tests performed in a routine eye exam, plus additional tests to detect learning-related vision problems. These extra tests may include an assessment of eye focusing, eye teaming, and eye movement abilities (also called accommodation, binocular vision, and ocular motility testing). Also, depending on the type of problems your child is having, we may recommend other testing, either in our office or with a children’s vision and/or vision development specialist.

Vision therapy

If it turns out your child has a learning-related vision problem that cannot be corrected with regular glasses or contact lenses, then special reading glasses or vision therapy may help. Vision therapy is a program of eye exercises and other activities specifically tailored for each patient to improve their vision skills.  

Vision and learning disabilities

A child who is struggling in school could have a learning-related vision problem, a learning disability or both. Vision therapy is a treatment for vision problems; it does not correct a learning disability. However, children with learning disabilities may also have vision problems that are contributing to their difficulties in the classroom.

After your child’s comprehensive vision exam, we will advise you about whether a program of vision therapy would be helpful. If we don’t provide the services we believe your child needs, we will refer you to a children’s vision specialist or education/learning specialist who does.

For more information on children’s vision, visit All About Vision®.

Article ©2009 Access Media Group LLC.  All rights reserved.  Reproduction other than for one-time personal use is strictly prohibited.

The Basics of Eyeglasses

May 15, 2009

Section: News — Tags: , , , — Dr. Curtis @ 2:21 pm

The Basics of Eyeglasses

This article was provided by AllAboutVision.com.  Follow the links below for more information on eye health and vision correction.

Eyeglasses are more popular today than ever, despite the availability of contact lenses and vision correction surgery.

Frame styles branded with high profile designer names are always in demand. And eyeglass frame materials have evolved with the advent of new plastics and various types of metals.

For safety glasses, you may want an extra tough plastic, such as polycarbonate. If you suffer from skin allergies, hypoallergenic metals such as titanium or stainless steel are good choices.

Certain frames are made with highly flexible metal alloys, which reduce the possibility of breakage. Spring hinges are also for added durability, and are a great option for children’s eyewear.

Eyeglass frames styles

Eyeglasses have also become quite popular as fashion accessories, with different colors and styles available to match their wardrobes.

Multi-colored inlays, composite materials, designer emblems, and enhancements such as insets of precious stones may also be found in popular frame styles.

Rimless styles have become more popular in recent years as an understated way to wear eyeglasses without obvious frames. Rimless styles mainly involve attaching plastic or metal temples directly onto the lenses rather than onto a frame.

Advances in eyeglass lenses

You also have many options when choosing the lenses for your eyeglasses. Among the most popular types of eyeglass lenses and lens options prescribed today are:

  • Aspheric lenses, which have a slimmer, more attractive profile than other lenses. They also eliminate that magnified, “bug-eye” look caused by some prescriptions.
  • High index lenses, which are made of new materials that enable the lenses to be noticeably thinner and lighter than regular plastic lenses.
  • Polycarbonate lenses are thinner, lighter and up to 10 times more impact-resistant than regular plastic lenses. These lenses are great for safety glasses, children’s eyewear, and for anyone who wants lightweight, durable lenses.
  • Photochromic lenses are sun-sensitive lenses that quickly darken in bright conditions, and quickly return to a clear state in ordinary indoor lighting.
  • Polarized lenses diminish glare from flat, reflective surfaces (like water) and also reduce eye fatigue.
  • Anti-reflective coatings are among the most popular add-ons for lenses. They can dramatically improve the look and comfort of your glasses by minimizing the amount of light that reflects off the surface of your lenses, which also has the added benefit of reducing glare and thus easing eye fatigue.
  • Other lens coatings include scratch-resistant, ultraviolet treatment, and mirror coatings.

 

Eyeglass lenses for presbyopia

Presbyopia is the normal, age-related loss of near focusing ability that makes reading and other close-up tasks more difficult after age 40.

This means that the usual type of eyeglass lenses you’ve likely been accustomed to wearing, known as single vision lenses, no longer will work well for you.

Multifocal eyeglass lenses available for presbyopia correction include:

  • Bifocals: Lenses with two powers – one for distance and one for near – separated by a visible line.
  • Trifocals: Lenses with three powers for seeing at varying distances – near, intermediate and far – separated by two visible lines.
  • Progressive lenses: These lenses have many advantages over bifocals and trifocals because they allow the wearer to focus at many different distances, not just two or three. Because they have no lines, progressive lenses allow a smooth, comfortable transition from one distance to another.

 If you see well in the distance without the need for eyeglasses, simple reading glasses with single vision lenses may be all you need to deal with near vision problems caused by presbyopia. 

Advice for Buying Eyeglasses

Your appearance, personal taste and lifestyle should all be considered when choosing eyeglasses. We can help you choose frames and lenses that both complement your appearance and meet your lifestyle needs.

Article ©2009 Access Media Group LLC.  All rights reserved.  Reproduction other than for one-time personal use is strictly prohibited.

Diabetic Retinopathy

May 10, 2009

Section: News — Tags: , , — Dr. Curtis @ 8:24 pm

Diabetic Retinopathy

This article was provided by AllAboutVision.com.  Follow the links below for more information on eye health and vision correction.

If you have diabetes, you probably know that your body can’t use or store sugar properly. When your blood sugar gets too high, it can damage the blood vessels in your eyes. This damage may lead to diabetic retinopathy. In fact, the longer someone has diabetes, the more likely they are to have retinopathy (damage to the retina) from the disease.

In its advanced stages, diabetes may lead to new blood vessel growth over the retina. The new blood vessels can break and cause scar tissue to develop, which can pull the retina away from the back of the eye. This is known as retinal detachment, and it can lead to blindness if untreated. In addition, abnormal blood vessels can grow on the iris, which can lead to glaucoma. People with diabetes are 25 times more likely to lose vision than those who are not diabetic.

Signs and symptoms of diabetic retinopathy

Anyone who has diabetes is at risk for developing diabetic retinopathy, but not all diabetics will be affected. In the early stages of diabetes, you may not notice any change in your vision. But by the time you notice vision changes from diabetes, your eyes may already be irreparably damaged by the disease.

That’s why routine eye exams are so important. Your eye doctor can detect signs of diabetes in your eyes even before you notice any visual symptoms, and early detection and treatment can prevent vision loss.

Floaters are one symptom of diabetic retinopathy. Sometimes, difficulty reading or doing close work can indicate that fluid is collecting in the macula, the most light-sensitive part of the retina. This fluid build-up is called macular edema. Another symptom is double vision, which occurs when the nerves controlling the eye muscles are affected.

If you experience any of these symptoms, see your eye doctor immediately. If you are diabetic, you should see your eye doctor at least once a year for a dilated eye exam, even if you have no visual symptoms.

If your eye doctor suspects diabetic retinopathy, a special test called fluorescein angiography may be performed. In this test, dye is injected into the body and then gradually appears within the retina due to blood flow. Your eyecare practitioner will photograph the retina as the dye passes through the blood vessels in the retina. Evaluating these pictures tells your doctor or a retina specialist if signs of diabetic retinopathy exist, and how far the disease has progressed.

What causes diabetic retinopathy?

Changes in blood-sugar levels increase your risk of diabetic retinopathy, as does long-term diabetes. Generally, diabetics don’t develop diabetic retinopathy until they have had the disease for at least 10 years. As soon as you’ve been diagnosed with diabetes, you need to have a dilated eye exam at least once a year.

In the retina, high blood sugar can damage blood vessels that can leak fluid or bleed. This causes the retina to swell and form deposits. This is an early form of diabetic retinopathy called non-proliferative or background retinopathy.

In a later stage, called proliferative retinopathy, new blood vessels grow on the surface of the retina. These new blood vessels can lead to serious vision problems because they can break and bleed into the vitreous, the clear, jelly-like substance that fills the interior of the eye. Proliferative retinopathy is a much more serious form of the disease and can lead to blindness.

Fortunately, you can significantly reduce your risk of developing diabetic retinopathy by using common sense and taking good care of yourself:

  • Keep your blood sugar under good control.
  • Maintain a healthy diet.
  • Exercise regularly.
  • Follow your doctor’s instructions to the letter.

How is diabetic retinopathy treated?

According to the American Academy of Ophthalmology, 95% of those with diabetic retinopathy can avoid substantial vision loss if they are treated in time.

Diabetic retinopathy can be treated with a laser to seal off leaking blood vessels and inhibit the growth of new vessels. Called laser photocoagulation, this treatment is painless and takes only a few minutes.

In some patients, blood leaks into the vitreous humor and clouds vision. The eye doctor may choose to simply wait to see if the clouding will dissipate on its own, or a procedure called a vitrectomy may be performed to remove blood that has leaked into the vitreous humor.

Small studies using investigational treatments for diabetic retinopathy have demonstrated significant vision improvement for individuals who are in early stages of the disease. Two medications that are closely related, Lucentis and Avastin, may be able to stop or reverse vision loss, similar to very promising results that have been reported when the two drugs have been used as treatments for macular degeneration.

Article ©2009 Access Media Group LLC.  All rights reserved.  Reproduction other than for one-time personal use is strictly prohibited.

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Vision Care Research at InSight Eyecare

InSight Eyecare is on the cutting edge of technology and helps shape the future of vision care by being a large research facility for many new products, including contact lenses, solutions, pharmaceuticals and eyewear lenses. Many of our current patients have participated in studies.
Research patients typically receive complimentary products and vision care. Many studies also pay monetary stipends when the patient finishes the study. If you would like to be considered for an upcoming research study, please call our Warrensburg office at 660-747-7300.

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