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 …
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 …

“Development of Vision and Visual Delays”

I read a very relevant developmental vision related article on the website of the American Acadamy of Ophthalmology. From ophthalmology quarters archaic, overly pro-surgery sounds are often heard when it comes to strabismus and developmental vision issues. Nonetheless, sometimes they pleasantly surprise you. The article shows awareness of the need to monitor visual milestones in infants and visual function in older children to maximize potential and quality of life. It also touches on the need to correct farsightedness or hyperopia as quickly as possible to avoid later problems. On the research level some…Read more …
INTERVIEW: “At age 58 I can finally see properly for the first time ever. I am finally at peace.”

INTERVIEW: “At age 58 I can finally see properly for the first time ever. I am finally at peace.”

MICHAEL: Hello K! Who are you and where do you live now? K: I was born in 1958 in the Cherokee Nation in the state of Arkansas. My ancestors were from the Eastern Band of Cherokees and migrated south from the Trail of Tears. I lived there from 1958-60  when we moved to Albuquerque, New Mexico, which is close to The Four Corners Area. I was adopted into a Hopi family from that region later. In 1966, my family moved to Oahu, Hawaii. My childhood and youth in Hawaii were pretty tough for various reasons.…Read more …

A New Year’s update from Bill Johnston (71)

A New Year's update from Bill Johnston (71) "Today is the second anniversary of the day that I permanently gained stereopsis. Random thoughts. There is no magic bullet. It takes time, lots of time, the brain has to adjust. My sudden onset of stereopsis may have seemed like a magic bullet, but it was six months in the making, by exercising every morning. My brain was not at all prepared to receive the new dimension of depth that the stereopsis gave it, so my progress accrued very slowly, my brain had to adjust…Read more …
Herb Black: Geologist turned Optometrist after 3D vision discovery

Herb Black: Geologist turned Optometrist after 3D vision discovery

"I had never had 3D vision, but didn't really know it until I was an adult. I noticed I had no 3D vision because, as a geologist, my colleagues would look at stereo pairs of aerial photos, fuse them in free space or with a viewer, and see 3D. I could not do that at all. It was a real mystery to me how they could do that, especially in free space without a 3D viewer. My daughter had binocular vision problems as a child and was helped tremendously by optometric vision therapy here in…Read more …
INTERVIEW: Nick Swaans, construction worker turned stereo vision builder

INTERVIEW: Nick Swaans, construction worker turned stereo vision builder

REMINDER: When reading on a desktop or laptop, you can have the article read to you by selecting the desired paragraph and clicking on the little speaker icon. NICK, THE BUILDER Nick Swaans is 25 years old, lives in Beerse (Belgium) and describes himself as a true born builder. With his 1,88 meters of length, Nick has an imposing stature. Some have described him as being a "rough diamond". Professionally, Nick is active as a construction worker at the Total oil refinery in the port of Antwerp. His specializes in groundwork, by both hand and machine.…Read more …

Confusing double vision: “I often feel like being on a cruise ship during a storm”

A comment from the Strabismus World Facebook page: "I have strabismus and amblyopia. At age 38, I had my first eye muscle surgery for crossed eyes which gave me really bad diplopia (double vision). Thank you for worsening my vision, Dr Mark Steckle. Finally, 4 years later, I found a Neuro-ophthalmologist who was willing to help. He collimated or aligned my eyes as best as he could but perfection is impossible. The dominant eye became strained and releases its grip of the recessive or weaker eye and this created the diplopia. The double…Read more …
INTERVIEW: How Bill Johnston discovered stereo vision at the age of 70

INTERVIEW: How Bill Johnston discovered stereo vision at the age of 70

REMINDER: When reading on a desktop, you can have the article read to you by selecting the desired paragraph and clicking on the little speaker icon. I first learned about Bill Johnston when, in early 2014, he posted this message in one of the amblyopia and strabismus Facebook groups. “My lazy eye turned on on New Year’s Day. I don’t have amblyopia anymore and I do have depth perception for the first time in my life. The whole world is more beautiful than I ever could have imagined. I will be 70 years old in the…Read more …