Many people mistakenly believe that contact lenses can become fully lodged in the back of the eye and become stuck […]
Abstract
Some individuals who use virtual reality (VR) head-mounted displays (HMD) have adverse visual symptoms.
Purpose
We measured oculomotor functions of symptomatic (n=10) and asymptomatic (n=10) individuals to determine if there were fundamental oculomotor performance differences. Method. Before and after 20 min of biocular VR- HMD use, we measured: phorias, fixation disparity, gradient accommodative convergence to accommodation ratio (AC/ A), stereopsis, and near point of convergence.
Results
We observed an exophoric shift in the near point phoria of almost all subjects, whereas the farpoint phoria showed no trend. Interestingly, we observed that the phoric shift at far and near was highly correlated for the asymptomatic subjects but not for the symptomatic subjects. In addition, the (stimulus) AC/ A ratio of symptomatic subjects was reduced after a period of VR- HMD use, whereas asymptomatic subjects' AC/ A ratio was not reduced.
Conclusion
The oculomotor changes among the symptomatic subjects (increased exophoria at near and reduced AC/ A) appears consistent with a reduced accommodative response. In contrast, the asymptomatic subjects show changes (correlated change in phorias) which seem most consistent with adaptation in the tonic component of vergence and/ or accommodation
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Dr. Kavner is a gifted diagnostician and orthoptic therapist. He treated me several decades ago for a condition similar to dyslexia. I was having migraines five times per week. I worked with him for about a year and I experienced tremendous improvement (down to 3-4 per year) that has lasted.
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Dr. Kavner recommended two types of eye therapy for my daughter. One of them using bio-feedback. In just three sessions she is seeing considerably better. She shouted this morning: Ooh my God! I could not see these letters with my glasses on, and now I can see them without my glasses. If you are willing and able to invest in improving your vision, this is a good place to go to!
I have always found Dr Kavner's work, expertise and wisdom of the highest caliber. As one of the fathers of OT, occupational othomology, his depth and breadth of knowledge about the eyes' health and wellbeing of the patient is exemplary. Cannot say enough good things about him.
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