Thursday, November 8, 2012

COVD Honors Outstanding Members

COVD Honors Outstanding Members

....Five individuals and one organization received awards for their contributions to developmental optometry during the Awards Luncheon held at the 42ndAnnual Meeting of the College of Optometrists in Vision Development (COVD), October 19, 2012, in Ft. Worth, Texas. Receiving recognition were Drs. Penelope Suter, Irwin Suchoff, Marie Bodack, and Janna Iyer; Mountain States Congress of Optometry; and Certified Optometric Vision Therapist International, Paula Peachey....

Coments: Read all about it by clicking on the title above. DM 

Wednesday, November 7, 2012

IMPORTANT: Opticians don't know how to measure PD for strabismics

IMPORTANT: Opticians don't know how to measure PD for strabismics

 ....Be extra careful when ordering prism glasses as some opticians have no idea what to do with strabismic patients and may calculate their own pupillary distance (PD) measurement that will not be the same as the developmental optometrist's PD. The difference in the PD measurement can have disastrous effects on your prescription. Although [XXXX] Retail says they'll change their training programs for their opticians after my incident, I don't know if they really will. Even if you go to non-[XXX] owned optical stores, make sure the optician doesn't override your doctor's prescription because of the "Standard Operating Procedure" for measuring PD. ....

Read more about how one individual experienced major difficulties because of problems with measuring pupillary distance for those with binocular vision problems by clicking the title above... DM



Monday, November 5, 2012

3-D Vision Syndrome…linked to “ADD-like” behaviors in children

3-D Vision Syndrome…linked to “ADD-like” behaviors in children

....A link between 3-D Vision Syndrome and a treatable binocular vision problems associated with “ADD-like” behaviors in children is being recognized. Not only has the advent of 3-D technology hit the bit screen, but  soon will become common place in the home as the next wave of 3-D televisions. However, for children to enjoy the 3-D visual experience requires that they have developed an essential visual function called binocular vision. Binocular vision involves the ability to effectively coordinate, focus and move the eyes effortlessly. This eye coordination function develops normally in early childhood for most kids however, research shows that as many as 10-15% of children will have difficulty in binocular function. Some children (3-5%) will have a total lack of binocular ability due to a complete failure of binocular vision known as strabismus. These children will have no appreciation for 3-D movies or 3-D television because these children are completely stereo blind......

Comments: This blog post was written by my friend and colleague, Dr. Fortenbacher on the COVD blog. To read more just click on the title above. Want to subscribe to the COVD Blog? Click here. DM 



A survey of visually induced symptoms and associated factors in spectators of three dimensional stereoscopic movies

A survey of visually induced symptoms and associated factors in spectators of three dimensional stereoscopic movies. BMC Public Health 2012, 12:779 doi:10.1186/1471-2458-12-779
Angelo G. Solimini (, Alice Mannocci (, Domitilla Di Thiene (, Giuseppe La Torre (


The increasing popularity of commercial movies showing three dimensional (3D) computer generated images has raised concern about image safety and possible side effects on population health. This study aims to (1) quantify the occurrence of visually induced symptoms suffered by the spectators during and after viewing a commercial 3D movie and (2) to assess individual and environmental factors associated to those symptoms.


A cross-sectional survey was carried out using a paper based, self administered questionnaire. The questionnaire includes individual and movie characteristics and selected visually induced symptoms (tired eyes, double vision, headache, dizziness, nausea and palpitations). Symptoms were queried at 3 different times: during, right after and after 2 hours from the movie.


We collected 953 questionnaires. In our sample, 539 (60.4%) individuals reported 1 or more
symptoms during the movie, 392 (43.2%) right after and 139 (15.3%) at 2 hours from the
movie. The most frequently reported symptoms were tired eyes (during the movie by 34.8%,
right after by 24.0%, after 2 hours by 5.7% of individuals) and headache (during the movie
by 13.7%, right after by 16.8%, after 2 hours by 8.3% of individuals). Individual history for

frequent headache was associated with tired eyes (OR = 1.34, 95%CI = 1.01-1.79), double
vision (OR = 1.96; 95%CI = 1.13-3.41), headache (OR = 2.09; 95%CI = 1.41-3.10) during the
movie and of headache after the movie (OR = 1.64; 95%CI = 1.16-2.32). Individual
susceptibility to car sickness, dizziness, anxiety level, movie show time, animation 3D movie
were also associated to several other symptoms.


The high occurrence of visually induced symptoms resulting from this survey suggests the
need of raising public awareness on possible discomfort that susceptible individuals may
suffer during and after the vision of 3D movies

Comments: This is a fairly good, open access study that demonstrates how viewing simulated 3D can be linked with several visual symptoms. Tired eyes, double vision, headache, vision induced motions sickness, and dizziness...all of which collectively are a part of 3D Vision Syndrome.....can significantly detract from an individuals 3D viewing.

This study lacks at least one very important component, that being an assessment of the binocular vision characteristics of the audience. Most of the current research on simulated 3D notes that accommodation and vergence play a major role in how a viewer reacts to 3D and the symptoms produced. It is thought that those individuals without preexisting functional vision problems do not appear to have the symptoms often noted with 3D Vision Syndrome.

In the best of all worlds, a multi-site clinical trial would likely determine just what is and is not associated with 3D Vision Syndrome. This would also allow those who produce simulated 3D content, 3D audiences and the doctors and therapists who treat 3D Vision Syndrome to produce a better product for the consumer as well as improved methods of diagnosing and treating this disorder.

For more info on 3D Vision Syndrome go to

3D EyeHealth

3D Vision Syndrome

You Can Help Your Patients See 3-D

Asthenopia: A Technology Induced Visual Impairment

What is 3D Vision Syndrome?

What to Do if You Feel Sick Watching 3D Movies

3D Vision Syndrome