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…continue reading →
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…continue reading →
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…continue reading →
What role do various brain areas play in vision? – Part 1

What role do various brain areas play in vision? – Part 1

After previously writing about the basal ganglia and the crucial role they play in vision and brain plasticity, I was intrigued and wanted to understand what implications binocular vision dysfunctions have for the brain as a whole more thoroughly. In this post, part 1, I will introduce more related brain…continue reading →
How to prevent a strabismus or double vision burnout

How to prevent a strabismus or double vision burnout

Perception is a constant flow of action and reaction. Your own actions, even unconscious ones like moving your eyes, and other events beyond your control shape your perception and your perception shapes your actions. Both are intimately linked in a lifelong perceptual stream. Once your mind is infected with the idea that…continue reading →

Strabismus is less a problem to be cured than a problem to be controlled

Surgery's lack of success in achieving good binocularity and the troubling trend of repeated surgeries and recurrance of the strabismus has predicably lead surgeons to have low expectations of the the results of strabismus surgery. In a recent journal article, one surgeon noted that "strabismus is less a problem to…continue reading →
Analysis of strabismus and its symptoms, patient prognosis and success rate of Vision Therapy

Analysis of strabismus and its symptoms, patient prognosis and success rate of Vision Therapy

My awesome friend and medical student Stephanie Johanns found the success rates of Vision Therapy for me through a medical search engine. She got me the Optometric clinical practice guidlines for the care of patients with accommodative and vergence dysfunction published by the American Optometric Association. She wanted me to have this…continue reading →