The Crowding Effect: Importance in reading readiness and its assessment

The Crowding Effect: Importance in reading readiness and its assessment

What is the crowding effect? People with amblyopia experience the crowding effect, which is described as difficulty reading a letter when it is surrounded by other letters or contours. For this reason, when testing visual acuity in amblyopes, you may measure a better visual acuity using isolated letters than if you use a single line or the entire chart. When reading a row of letters, amblyopes can usually also read the first and last letters more easily than the middle letters. The crowding effect is more pronounced in strabismic amblyopes than anisometropic amblyopes.…Read more …
E-book version of ‘Applied Concepts in Vision Therapy’

E-book version of ‘Applied Concepts in Vision Therapy’

As you might have noticed lately, I've been studying and sharing many interesting passages from the book 'Applied Concepts in Vision Therapy' by Leonard Press. It's pretty darn awesome but it took me a long time before I was able to start reading it. I ordered the physical copy from OEPF years ago and only recently found a way to turn a book into an audio file: I scanned the book, had a program run text recognition on the images and then turned the text into an audio file. This cumbersome process allowed…Read more …

FAQ: Example of a Comprehensive Visual Processing Evaluation intake report (PDF)

Below you will find the intake report of a 58 yo female patient suffering from Convergence Insufficiency and various other visual deficiencies. This report was compiled based on two separate one hour testing sessions. The two sessions were done on two different days in order not to have fatigue skew the results.  Page 1 gives a statistical overview of how the patient did in terms of population percentile or age equivalent and whether or not this performance was adequate for healthy every day visual function. Page 2 to 5 explain what the various…Read more …
Developmental timelines of Amblyopia

Developmental timelines of Amblyopia

This table is taken and completed with information from the book "Applied Concepts in Vision Therapy" by Leonard Press.   "Critical period: birth to 6 months aggressive treatment required: critical to provide child with clear visual input lack of treatment results in legal blindness and nystagmus untreated infantile cataract is an extreme model of consequences of deprivation during early visual development. They exhibit dense, irreversible amblyopia with nystagmus infantile cataract is most treatable amblyogenic factor at this age other amblyogenic factors are maximally influential at this age Sensitive period: 6 months to age…Read more …
Redefining Amblyopia as disorder of vision development

Redefining Amblyopia as disorder of vision development

I am studying various chapters from the book "Applied Concepts in Vision Therapy" by Leonard Press. In this blog post I have compiled some of the most relevant and poignant quotes from chapter 7 called "Amblyopia: A Microcosm of Visual Disorders". "Various tacks of amblyopia research:  Conclusions of the Hubel and Wiesel research: form deprivation results in profound alterations of the total visual system. Practicioners should monitor amblyogenic factors (!) such as strabismus, uncompensated anisometriopia, high uncompensated isometropic defocus, organic defocus as a result of disease (cataract, glaucoma, ...), or iatrogenic defocus such…Read more …

FAQ: What ocular and neurologic diseases can be masquerading as functional vision disorders?

This incomplete list was compiled using the 6th chapter of 'Applied Concepts in Vision Therapy' by Leonard Press. Use Google at your discretion.  Ocular and neurological diseases sometimes misdiagnosed as amblyopia: - craniopharyngioma - Coats' disease - optic nerve disease - optic nerve hypoplasia - glaucoma - retinoblastoma - toxo-retinochoroiditis Diseases sometimes misdiagnosed as bilateral amblyopia: - foveal schisis / foveal detachment / macular holes - retinitis pigmentosa / cone-rod dystrophy - Stargardt's macular degeneration - keratoconus Occult neurologic disease masquerading as a binocular dysfunction: - pituitary adenoma - multiple sclerosis (MS)Read more …

“Our senses can’t learn under stress”

Having compromised sensory abilities can be very stressful and that in turn can impede rehabilitation or further development. Creating a climate of understanding conducive to sensory learning is thus of paramount importance. Read the entire article at: http://neurosciencenews.com/stress-learning-senses-5942/ "Stress is part of our everyday lives – while some thrive on it, it makes others sick. But what does stress do to our senses? When we train them, we can sharpen our senses thereby improve our perceptual performance. The stress hormone cortisol completely blocks this important ability. In the current issue of “Psychoneuroendocrinology” neuroscientists of…Read more …

TESTIMONIAL: ‘The cost of eye muscle surgery vs Vision Therapy’ by Betsy Yaros

I related very much to this testimonial blog post by a young woman named Betsy Yaros. It even made me tear up a little when talking about how poorly she has been treated, her reading problems and difficulty in getting a suitable education and work. I think many strabismics will relate to this. Some of the eye doctors treated this person in an absolutely disgraceful way. Fortunately, someone pointed her towards VT and the results are coming in quite fast for her. I hope in time I will achieve what she is achieving.  This…Read more …
The Hess Test: How does it work and why is it administered?

The Hess Test: How does it work and why is it administered?

The Hess Test involves anaglyph glasses and a grid attached to a wall or screen in front of the patient. The purpose of this test is to get an idea of whether or not the eyes align absent of any exterior reference points and thus without any compensation ability the patient might usually be employing. During the test the patient is wearing anaglyph glasses while watching the grid. Somewhere within the grid a red light will illuminate itself or will be projected by the clinical assistent. The patient has a green laser pointer…Read more …
Research: The Effects of Sports Vision Training on Binocular Vision Function in Female University Athletes

Research: The Effects of Sports Vision Training on Binocular Vision Function in Female University Athletes

An interesting piece of research, available on the website of the US National Institutes of Health, came to my attention recently. It was published in December, 2015. It is part of a growing body of research validating the efficacy of Vision Training. I'm posting it here because it also includes some practical exercises which might inspire you to try them yourself. If you are a strabismic, make sure the risk of double vision or other adverse side effects is under control by talking to a qualified Behavioral Optometrist. URL: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4723179/  The Effects of Sports Vision…Read more …