Can't recognize faces? You may have a brain-related vision problem.

A study in the new issue of Optometry and Vision Science helps increase our understanding of how people recognize faces and why some people have difficulty with that task.

The authors looked at adults who had one eye removed while they were babies.  The study's results show that face perception is more difficult for adults that developed with the use of only one eye. The authors propose that vision connections in the brain may be reorganized in response to the removal of one eye and suggest that the visual system requires normal binocular vision  (two eyes working together) during development in order for brain areas associated with the perception of faces to fully mature.

The study has important implications for childhood vision care and suggests that vision problems during childhood development can have lasting impacts on brain development.  Optometrists routinely check for and treat conditions that can impact normal binocular vision such as amblyopia, strabismus and convergence insufficiency. 

It is important, critical even, for parents to have their children's eyes examined every year to ensure that such a condition does not go untreated.  Most of these conditions are easier to treat while the child is very young.  Optometrists can examine a child as young as six months to ensure that their eyes and visual system are developing properly and can then monitor potential problems as the child grows and develops.  If  problems materialize they can be treated effectively if caught early. If you are a parent, click here to review my childrens' vision guidelines. For more information on optometry for children, click here.

The unseen danger of diabetes

More than 20 Canadians are diagnosed with diabetes every hour of every day. I encourage anyone who has, or may be at risk for, diabetes to have an annual eye examination.

Diabetes affects 3 million Canadians, many of whom may not know they have the disease. One of the health problems associated with diabetes is diabetic retinopathy, a disease of the eye which can cause blindness.

Diabetic retinopathy can weaken and cause changes in the blood vessels that nourish the retina. Symptoms may include blurred vision, cloudiness and/or “floaters”.

Diabetes also increases a person’s risk for developing other eye diseases. Persons living with diabetes are 40% more likely to develop glaucoma and 60% more likely to develop cataracts.

The most worrying aspect of diabetes may be the fact that in the early stages diabetic retinopathy may produce no visual symptoms at all. That is why it is so important for anyone who has diabetes or a family history of diabetes to have a yearly comprehensive eye health examination.  Early detection and treatment are essentialbecause once damage has occurred, the effects are usually permanent.

An added benefit of eye exams, is that they are often the medical test that is the first to detect a variety of diseases - not just diabetes.

Catch Dr. Randhawa on RJ12OO on Monday January 23, 2011 at 2:00 pm

Dr. Randhawa will be on the radio today - 1200 on the AM dial at 2:00 PM today. 

She will be talking about new developments in eye care  including topics like new and sometimes dangerous ways to change the color of your eyes; healthy sight healthy mind: the connection between vision and Alzheimer's disease; new research into the connection between a common eye movement disorder - convergence insufficiency - and ADHD and academic performance and how vision therapy can help. 

To learn about these and other interesting topics  click here to go to the RJ1200 website and listen live on the web.

Woman gets eye color surgery in Panama and goes blind

The "Ask a Doctor of Optometry" facebook page has unearthed another news item concerning the dangers of the risky methods that some people in the globalized Internet age use to access medical care and medical products.  The first was a story of a Toronto man who purchased contact lenses online only to have them peel off a chunk of his cornea.

Now comes the story of Toronto artist, Beatriz Murillo, 36, who went to Panama for medical tourism.  She went to get an iris implant to change the color of her eyes. The surgery is not available in Canada or the United States.  Now she is legally blind and has undergone three followup surgeries including a corneal transplant.  "I'm an artist and I'm afraid I'm never going to be able to paint again," the woman was quoted as saying.

Anyone considering surgery in a foreign country, especially for cosmetic reasons, needs to get the advice of a doctor in their home country before they make a decision.  Obviously, medical tourism can turn out very badly. 

Another issue is the drain on the Canadian medical system caused by this medical tourism tragedy.  This patient had three surgeries one of which was a corneal transplant.  Some other patient could have used that cornea and other patients could have occupied the hospital beds and surgeon's time. This waste of taxpayer money could have been avoided if this patient talked to her eye doctor first.  It seems quite ill-advised to go to a foreign country for a medically unnecessary cosmetic procedure that is not available at home.  Presumably it is not available at home for a good reason.

As for changing the color of your eyes, color contact lenses are the only safe way.  There is a doctor in California who claims to have come up with a 20 second laser surgery that can turn brown eyes blue but I don't think that the procedure's safety and long term effects have been evaluated.  I identified some potential risks and drawbacks to such a surgery in a previous post.

Image courtesy of marin / FreeDigitalPhotos.net

Vision therapy for convergence insufficiency improves academic behaviors

We know that in-office optometric vision therapy is the best available treatment for convergence insufficiency.  Convergence insufficiency is a concern for parents, patients and doctors because it causes the eyes to malfunction when doing near work such as reading. And that is a problem because it impacts academic performance. 

We now have a study that confirms that academic behaviours, as measured by the Academic Behavior Survey (ABS), improve following successful treatment of convergence insufficiency.  The study was published in the January 2012 issue of Optometry and Vision Science.

The study's conclusion was that "A successful or improved outcome after CI treatment was associated with a reduction in the frequency of adverse academic behaviors and parental concern associated with reading and school work as reported by parents." 

To the doctors at our Vancouver clinic, the study simply states the obvious.  The whole reason why convergence insufficiency is treated is because it adversely impacts a patient and a successful treatment would improve the patient's life by removing those adverse impacts.  Furthermore, it logically follows that if convergence insufficiency adversely impacts near work, reading and academics will be challenging for the patient.

More importantly, since we treat convergence insufficiency with vision therapy at our office, we have seen academic improvement following treatment many times - often reported to us by the patient's parents.  Nevertheless, it is always useful to have a scientific research paper to refer to. 

For those who want to get into the nitty-gritty of the results and statistics, here they are:

The mean ABS score for the entire group at baseline was 12.85 (SD = 6.3). The mean ABS score decreased (improved) in those categorized as successful, improved, and non-responder by 4.0, 2.9, and 1.3 points, respectively. The improvement in the ABS score was significantly related to treatment outcome (p < 0.0001), with the ABS score being significantly lower (better) for children who were successful or improved after treatment as compared to children who were non-responders (p = 0.002 and 0.043, respectively).

Other vision disorders that impact academics include binocular vision disorders in general (of which convergence insufficiency is one) and visual information processing or visual skills deficits.

Related articles:

More visual symptoms means lower academic performacne ... - See For Life

Feb 29, 2012

In a study published in 2006 in the journal, Optometry, researchers set out to determine whether there was an association between vision-related quality-of-life factors and academic performance. To answer the question, the ...

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Vision therapy for convergence insufficiency improves academic performance ...

Jan 16, 2012

We now have a study that confirms that academic behaviours, as measured by the Academic Behavior Survey (ABS), improve following successful treatment of convergence insufficiency. The study was published in the ...

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82% of teachers report an improvement in students  after vision therapy - See For Life

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between vision problem detection, academic achievement and vision therapy intervention. ... The result is also expected from all the studies that have been done on vision therapy and its impact on academic performance.

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Binocular vision dysfunctions ate my homework - See For Life

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Most developmental optometrists have stories of patients whose academic behaviours and performance have improved following vision therapy treatment of their binocular vision problems. Research studies have shown the ...

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Study proves that vision problems interfere with learning - See For Life

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The researchers (consisting of professors of optometry and occupational therapy), set out to compare visual and visual-information processing skills between children with and without mild reading and academic problems and ...

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60% of learning disabled students failed two or more binocular vision tests