Category vision rehabilitation

The Functional Effects of Nystagmus

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What is nystagmus?

Nothing can appear so disruptive as eyes that are constantly moving. Therapist’s become very concerned as they attempt to imagine how a child with nystagmus sees the universe and the functional affects of these constantly moving eyes.

Nystagmus is an involuntary movement of the eyes. While most are in a horizontal plane, the nystagmus may be vertical, or even rotary.

The nystagmus may be defined by the time of onset.

  • A congenital nystagmus is present at birth or develops in the first six months after birth.
  • An acquired nystagmus develops later in life and may be assist with multiple sclerosis, brain injury or drug and alcohol use. (1)

The nystagmus may be further defined by the type of movement observed.

  • A “jerk” nystagmus is slow in one direct and fast in the other
  • A “pendular” nystagmus is the same speed in both directions
  • A “rotary nystagmus” has the rotating on the Z-Axis

The cause of most congenital nystagmus is may be associated with:

  • retinal disorders leading to low vision
  • Albinism
    • Albinism has several vision related co-morbidities including low vision and retinal problems, which may be present as well(2)
  • a family history of nystagmus
  • neurological problems at birth

These conditions may lead to life long nystagmus causing social as well as low vision related problems (3)

There are not many effective treatments for nystagmus with medications (gabapentin and memantine) emerging as helpful in some cases. (6)

Here are some videos with examples of nystagmus

Adaptation to nystagmus

Children with congenital nystagmus do not see the world moving constantly. The brain develops with this occurring and adapts though the child may need glasses to get their best vision. There is evidence that congenital nystagmus has little effect on reading performance(4), while another study suggest “crowding” could be a problem decreasing reading performance(5).

The initial adaption to an acquired nystagmus is location of the “null point”. This is a head position in which the nystagmus is reduced or eliminated. This may be perceived in child as a torticollis making an eye exam critical in children with torticollis. Surgical intervention may be used to realign the eyes to “move” the null point to allow for a better head position.

What do we do to help?

There is no effective therapeutic treatment a PT or OT can do to reduce a nystagmus. The child should be in best corrected visual acuity to use his vision most effectively. Know that the child with congenital nystagmus does not perceive the world as bouncing around. It becomes the job of therapist to make sure those usual developmental skills are learned or adaptations made for low vision as needed.

Learn More

Learn more about this subject in a live course and webinar presented by Robert.  Its now available as a webinar too!! Hosted by PESI Education.

 

(1) Does your child have involuntary eye movements (nystagmus)? (n.d.). Retrieved from https://www.allaboutvision.com/conditions/nystagmus.htm

(2)Summers, C. G. (2009, June). Albinism: Classification, clinical characteristics, and recent findings. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/19390472

(3)Pilling, R. F., Thompson, J. R., & Gottlob, I. (2005, October). Social and visual function in nystagmus. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/16170116

(4)Barot, N., McLean, R. J., Gottlob, I., & Proudlock, F. A. (2013, June). Reading performance in infantile nystagmus. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/23462273

(5)Huurneman, B., Boonstra, F. N., & Goossens, J. (2016, August 01). Perceptual Learning in Children With Infantile Nystagmus: Effects on Reading Performance. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/27548897

(6)Papageorgiou, E., McLean, R. J., & Gottlob, I. (2014, October). Nystagmus in childhood. Retrieved from https://www.ncbi.nlm.nih.gov/pubmed/25086850

An Occupational Therapist Treats Convergence Insufficiency

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An OT treats CI

The process the author uses to treat convergence insufficiency has proven in his clinic to be very efficient, effective and repeatable. Symptoms are generally resolved in 8-10 visits for neuro-typical children and adolescences. This treatment process does not include assessment of primitive reflexes though many of the activities (not by design) may help to integrate these retained reflexes. Treatment sessions are twice a week for one hour. Home programs consist of a brock string performed 3-4 minutes in the morning and afternoon. The patient returns for their annual eye exam one year later and remain symptom free.

The Referral

Most of the referrals are made by Dr. Mark Obenchain OD, a binocular vision/peds specialist. He is a graduate of Indiana University where he completed a residency in binocular vision and pediatrics. He accepts all insurances and Medicaid.  Our patients cover a board spectrum of demographics with approximately 2/3rds being neuro-typical and the remaining 1/3rd having an additional diagnosis such as ADHD, Autism, or other developmental delay. A complete pediatric eye exam with cycloplegic dilation is performed on every child under the age 18 regardless of complaints.

The doctor diagnoses CI when:

The OT Evaluation

The occupational therapy evaluation begins with medical history, medication history and a discussion of academic performance and hobbies.

The following testing is performed:

  • extra ocular movements
  • tracking
  • stereopsis
  • near point of accommodation
  • near point of convergence
  • Developmental Eye Movement Test
  • Beery VMI, Visual Perception and Motor Tests
  • Observations are made during proactive and rotator 3 activities on Sanet Vision Integrator for eye-hand coordination, posture and balance. This performed while patient stands on balance board.

The author does not assess visual perception at this time as the patient has been diagnosed with a near vision problem which could taint the results of this test. An OT evaluation is also an untimed code making the 30-45 minute test not efficient to perform at this time. If visual perceptual problems exist after meeting all CI related goals, then visual perception is assessed and treated.

The Goals

The therapy goals are specific and measurable as well as being tied to function.

  1. LTG–Pt to demonstrate age appropriate visual skills
    1. STG–Pt to demonstrate near point convergence< 6 cm on 5 trials
    2. STG–Pt to fuse 15 BO loose prism to demonstrate improved fusion skills for improved reading and close  tolerance.
    3. STG–Pt to complete 20/30 Rock card with 2.00 flipper in 60-90 seconds to demonstrate age appropriate accommodation skills to improve read and close work tolerance.
    4. Complete Developmental Eye Movement test with age appropriate ratio to demonstrate improve ocular motor accuracy for reading tasks.
    5. STG–Pt to demonstrate age appropriate visual motor integration as tested by Beery VMI
  2. LTG–Pt to be (I) in use brock string to support in clinic treatment.

The Treatment Protocol

The below protocol has been effective and repeatable with most neuro-typical children ages 6 and up. The author has modified activities for children that have difficulties with these tasks which lengthens the amount of treatment sessions but are still effective in meeting the above goals.

  1. On the Sanet Vision Integrator
    1.  Proactive, performed monocular using R/B glasses, while standing on balance board, therapist holds head still while patient alternates touching dots with right then left hands regardless of placement of dots.
    2. Rotator 3, monocular, while on balance board. May touch with any hand, verbal cues to recall alphabet as needed.
  2. Convergence activities
    1. Tranaglyph slides with goal of reaching 30 BO and 12 BI.
    2. Loose prism Jump Vergences with “circle X square” tranaglyph for binocular feedback.
  3. Accommodation
    1. Accommodative Rock task, monocular
  4. Saccades 2 task on Sanet Vision Integrator, while on balance board, monocular with R/B glasses, head held still as needed. Goal is achieve 100% accuracy .5 interval with words.
  5. After improving with these tasks, pt may be progressed to aperture arm, often challenged with 1.00 flipper to maintain focus
  6. Visual motor integration tasks, tracing shapes, copying geoboard forms on paper and/or chalkboard/SVI and other visual motor tasks.
  7. HTS Autoslide performed at end of session

CPT code 97530- therapeutic activities, a timed code, is used for all sessions.

The Outcome

Patient are discharged upon reaching all goals as stated above on two consecutive visits. When this has occurred there have been no re-referrals for CI. There is also a resolution to many other symptoms including

  • resolution of headaches
  • improve reading fluency
  • a resolution to letter reversals in most cases
  • improve handwriting
  • improvement is self-esteem

Learn More

Learn more about this subject in a live course and webinar presented by Robert. Hosted by PESI Education. 

About the Author

 

 

 

Legally Blind

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“Pt is legally blind”

What does it mean when a patient is legally blind? Technically, to be legally blind, ones visual acuity in best correction is less than 20/200. Here is a great simulator to help one imagine what that would look like. But functionally, how does does being “legally blind” affect the patient?

We need more information

A patient can be legally blind for several reasons. Cataracts, macular degeneration, and diabetic retinopathy all leave a patient with reduced visual acuity but leave the patient with very different residual vision and different functional problems as a result of this condition.

A patient with macular degeneration will have reduced vision in the central field affecting reading and the ability to see faces like the below picture.

can-macular800

Glaucoma will result in reduced peripheral vision that could affect balance and peripheral awareness.

Vision-With-Glaucoma-2

With retinopathy, the areas of reduced vision may be more random and will have different affects depending on just where these damaged areas are.

retinopathy

How bad is it?

Is the patients vision truly 20/200 or is it worse. Visual acuities can be 20/400/ or even 20/1000. A patient that was 20/400 and now is improved to 20/200, will find their vision to be much improved and very happy about that. A patient may have an acuity described as “nlp” or no light perception. In this case, the patient would see nothing but blackness.

Is the described acuity with glasses in place? A specialized low vision refraction from a low vision optometrist could get the patient improved visual acuity optimizing their residual vision.

Ask the Right Questions

Why does this patient have low vision? How bad is there acuity? Are they wearing the best possible glasses for their diagnosis? With this information, we will be better able to assess the functional implications of this patients reduced vision and come up with the most effective strategies to keep them independent and safe.

Learn More

Learn more about this subject in a live course and webinar presented by Robert.  Its now available as a webinar too!! Hosted by PESI Education. 

About the Author

“Is it a vision problem?”

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Does this child have a visually-based problem?

Our children present with a vast array of problems affecting their development and academics. Sensory problems, trauma, autism, behavior, ADHD and the list goes on. Our children get assessed by OTs, and PTs, neurologists, neuropsychologists, and pediatricians. But did they have an eye-exam? A complete eye exam? Only 40% of children have had their eyes examined by an eye doctor. (1) That leaves all of those children potentially walking around with vision problems affecting their academic and developmental development. Meanwhile, we attempt to teach them catch a ball or write the alphabet or button a button.

“Does he need an eye exam?”

YES!!! Every child, regardless of academic performance or other diagnosis, needs a complete eye exam with a binocular vision assessment and cycloplegic dilation, even if the child has never complained about their vision.  Many times, when a child is assessed with the Convergence Insufficiency Symptom Survey, they learn that they are not supposed to see “words moving” on the page or see double when they read. They had symptoms and were not even aware. Most children with ocular motor or near vision problems will read letters on a chart without difficulty. 20/20 means only that each eye has good acuity. It does not tell us how well the eyes are working together or how hard the eyes are working to make a 20/20 acuity. Only a complete eye exam with binocular assessment and cycloplegic dilation can give the whole picture.

“Is this is visually-based problem?”

There are many signs a child is having a visual-based problem.

  • Eye rubbing
  • unexplained headaches
  • poor handwriting
  • poor reading skills that do not improve with tutoring
  • head turning or tilting when reading
  • closing one eye while reading
  • poor visual motor integration that does not improve practice
  • poor balance or motion sensitivity
  • Diagnosed ADHD that does not respond to medication
  • unable to catch a ball
  • letter reversals
  • visual perceptual problems
  • spacing and size problems during handwriting tasks
  • fine motor delays
  • poor depth perception

These problems maybe mis-diagnosed as things like dyslexia or ADHD and even be treated as such without success for many years.

“Who do I send them to, to make sure they a complete eye exam?”

A good place to start is College of Optometrists in Visual Development. These doctor specialize in the assessment and treatment of eye movement disorders and near vision focusing problems that could be affecting academic performance. You can your local COVD doctor with the search tool on the site. One might also look for an optometrist that specializes in pediatrics or binocular vision.

When an appointment is made, be specific about symptoms and ask for a “binocular vision assessment”.

Every child

Every child needs a complete eye exam. Parents may have many reasons to not get this dome, but you cannot teach a child read or write, or catch a ball that cannot see.

Learn More

Learn more about this subject in a live course and webinar presented by Robert.  Its now available as a webinar too!! Hosted by PESI Education. 

1.Children’s Vision Screening and Intervention. (n.d.). Retrieved from https://nationalcenter.preventblindness.org/childrens-vision-screening-and-intervention

Autism and Vision

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Autism and Sight

There has been several recently published articles on autism with some dysfunctions being found at a higher rate than in the neuro-typical population. One study, published in January 2017, found consistently that children with autism reacted slower to changes in light (pupillary light reflex). The pupillary light reflex was slower when lighting changed and, in darkness, the pupil measured smaller than controls.(1)

A second study, published in 2018, found a higher rate of accommodative problems (17.4% for ASD, vs 4.9% control) for children diagnosed with autism. While there was no substantial difference in the rate of refractive error, this higher rate of accommodative problems makes a complete eye exam with assessment of near vision acuity more important.(2)

A review of evidence found several contradictory studies concerning the prevalence of eye movement defects associated with autism, though most agree that saccades inaccuracy as well as difficulties in tracking are common in ASD. These movement problems, coupled with other fine and gross motor deficits found in autism suggests a cerebellar problem.(3)

Autism and Vision

Difficulties with the integration of visual information is found in several studies. All of these studies point to a lack of integration between the parvocellular and magnocellular tract and reduced communication between these tracts.(3)

Studies found differences in VEPs (visually evoked potentials) studies in the activity of the magnocellular tract compared to neuro typical children. The difference was, most notably, a slower recovery period for the magnocellular tract and therefore, decreased integration of the information. Functionally, this may help explain the visual spatial problems frequently seen in ASD diagnosed children. (4, 5)

Lateral gazing’ behavior was also found in some children with ASD as they attempted to use peripheral vision to reduced central visual pathway input. (3) This behavior is also suggestive of magnocellular tract deficits.

Integration Deficits

A common thread through many of these studies is a decreased integration of visual information and motor pathways and the cerebellum. (6) This lack of integration could help explain the ocular motor and saccade problems, as well as increased incidence of gait problems and toe walking (7,8) and visual motor integration problems found in children with ASD. A study also showed that people with ASD do not make good use of visual information to correct posture (9). Addressing this lack of integration could be helpful making functional progress with children on the spectrum.

Summary

A complete binocular vision exam with cycloplegic dilation is very important for every child with autism (and neuro typical children too) given the potential for a higher rate of accommodative and ocular motor problems and fine motor, reading and handwriting problems.

Given the evidence of integration problems, activities for children with ASD should be “top down” type activities that require the integration of movement and vision.

Much of this research is very recent and found some changes from previous research. Many of the studies suggested these differences in results were related to redefining autism with the release of DSM-5 eliminating Aspergers and pervasive developmental disorder and grouping these into the current terminology of autism spectrum disorder. The inclusion of these subjects in studies have helped improve the understanding of vision and autism. Many of the studies also sited small samples as potential limitations.

Learn More

Learn more about this subject in a live course and webinar presented by Robert.  Its now available as a webinar too!! Hosted by PESI Education. 

(1)Anketell, P. M., Saunders, K. J., Gallagher, S. M., Bailey, C., & Little, J. A. (2018, March). Accommodative Function in Individuals with Autism Spectrum Disorder. Retrieved March 05, 2018, from https://www.ncbi.nlm.nih.gov/pubmed/29424829

(2)DiCriscio, A. S., & Troiani, V. (2017, July 25). Pupil adaptation corresponds to quantitative measures of autism traits in children. Retrieved March 05, 2018, from https://www.ncbi.nlm.nih.gov/pubmed/28743966

(3)Bakroon, A., & Lakshminarayanan, V. (2016, July). Visual function in autism spectrum disorders: a critical review. Retrieved March 05, 2018, from https://www.ncbi.nlm.nih.gov/pubmed/27161596

(4)Jackson, B. L., Blackwood, E. M., Blum, J., Carruthers, S. P., Nemorin, S., Pryor, B. A., . . . Crewther, D. P. (2013, June 18). Magno- and Parvocellular Contrast Responses in Varying Degrees of Autistic Trait. Retrieved March 05, 2018, from https://www.ncbi.nlm.nih.gov/pubmed/23824955

(5)Sutherland, A., & Crewther, D. P. (2010, July). Magnocellular visual evoked potential delay with high autism spectrum quotient yields a neural mechanism for altered perception. Retrieved March 05, 2018, from https://www.ncbi.nlm.nih.gov/pubmed/20513659

(6)Miller, M., Chukoskie, L., Zinni, M., Townsend, J., & Trauner, D. (2014, August 01). Dyspraxia, motor function and visual-motor integration in autism. Retrieved March 05, 2018, from https://www.ncbi.nlm.nih.gov/pubmed/24742861

(7)Accardo, P. J., & Barrow, W. (2015, April). Toe walking in autism: further observations. Retrieved March 05, 2018, from https://www.ncbi.nlm.nih.gov/pubmed/24563477

(8)Kindregan, D., Gallagher, L., & Gormley, J. (n.d.). Gait deviations in children with autism spectrum disorders: a review. Retrieved March 05, 2018, from https://www.ncbi.nlm.nih.gov/pubmed/25922766

(9)Morris, S. L., Foster, C. J., Parsons, R., Falkmer, M., Falkmer, T., & Rosalie, S. M. (2015, October 29). Differences in the use of vision and proprioception for postural control in autism spectrum disorder. Retrieved March 05, 2018, from https://www.ncbi.nlm.nih.gov/pubmed/26314635

The Hart Chart

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Accommodation

Accommodation is one of the mechanisms that allow us to see up close. Accommodation is the focusing of the lenses in each eye. This action, combined with the convergence, allows for us to see clearly up close. 

Accommodation is the result of the contraction of the ciliary bodies in the eye which allow for the lens to get thicker thereby focusing the image better in the fovea. This action also includes the constriction of the pupil which more precisely focuses the light on fovea making the image sharper. Here is video of this in action

 

“Its blurry up close”

When accommodation does not work, one may see blurry up close, get headaches or rub the eyes due to eye strain. The ciliary muscles attempting to make the image clear, causes this discomfort discomfort. Accommodation can be exercised to strengthen it to improve near vision. This is generally performed in conjunction with convergence exercises to improve near vision  when one treats convergence insufficiency.

The Hart Chart

A simple way to improve convergence is using a Hart chart. With this activity, a grid of letters is placed at distance and one is held by the patient, near. The patient then reads a line close (or letter) then a line at distance. This is done with one eye occluded so the accommodative action is exercised as the eye focuses near then far. In my clinic, this performed while standing on balance board to further challenge the patient. This simple activity is quite effective at strengthening accommodation. A Hart chart can be purchased from Bernell, found on the internet and is included on the Vision Rehabilitation for Pediatrics Course Companion flash drive. Heres a video.

The Hart chart is one way accommodation can be strengthened. In optometric vision therapy, lenses can be used to strengthen accommodation using an activity called Accommodative Rock.

Support your local Optometrist

A complete binocular vision assessment should be conducted before performing these tasks to make sure that are appropriate. Only an ophthalmologist or optometrist can accurately diagnose an accommodative problem.

Learn More

Learn more about this subject in a live course and webinar presented by Robert.  Its now available as a webinar too!! Hosted by PESI Education. 

Fine motor skills and vision

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Does binocular vision affect fine motor ability?

Occupational therapy has been treating fine motor problems since the beginning of the profession. From tying shoes to buttoning to handwriting, when children or adults have difficulty with this, occupational therapy is referred.

Binocular vision?

A small study (1) looked at the fine motor skills of children with reading difficulties and found those with fine motor problems also had binocular vision problems, specifically accommodative problems.  While a small study (19 children), this suggests that vision is playing a role in fine motor coordination.

Another study (2) found that children that were poor readers showed a higher occurrence of binocular vision difficulties and suggested a need for the assessment of these skills in problem readers.

Research also indicates the importance binocular vision and motion perception to development of the motor skills(3) as young a 2 years old.

OT and binocular vision

As therapists, we are seeing children with difficulties that could have a binocular vision component. While a through binocular eye exam should be completed to rule out treatable defects, therapists integrating tracking, saccade and convergence activities could help improve outcomes for their patients. Our background in developmental sequence, kinesiology and assessment of functional ability make therapists the perfect profession to address these deficits. As therapists, we address the motor part of visual motor problems, but basic tracking, eye-hand coordination tasks could help with outcomes by improving the visual aspects of this skill.

The Therapist/OD team

Therapists, both PT and OT, should get the training to feel comfortable integrating these simple tasks into the interventions they already perform. Next, reach out to optometrists in their area. This relationship will be beneficial for both the therapist and optometrist, but mostly, this will help the patient.

Learn More

About the Author

Learn more about this subject in a live course and webinar presented by Robert.  Its now available as a webinar too!! Hosted by PESI Education. 

(1)Niechwiej-Szwedo, E., Alramis, F., & Christian, L. W. (2017, October 27). Association between fine motor skills and binocular visual function in children with reading difficulties. Retrieved November 13, 2017, from https://www.ncbi.nlm.nih.gov/pubmed/29096178

(2)Palomo-Alvarez, C., & Puell, M. C. (2010, June). Binocular function in school children with reading difficulties. Retrieved November 13, 2017, from https://www.ncbi.nlm.nih.gov/pubmed/19960202

(3)Thompson, B., McKinlay, C. J., Chakraborty, A., Anstice, N. S., Jacobs, R. J., Paudel, N., . . . CHYLD, T. E. (2017, September 29). Global motion perception is associated with motor function in 2-year-old children. Retrieved November 13, 2017, from https://www.ncbi.nlm.nih.gov/pubmed/28864240