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A PC-based shutter glasses controller for visual stimulation using multithreading in LabWindows/CVI.

Ivan Gramatikov¹, Kurt Simons², David Guyton²

¹Towson University, Baltimore, MD, USA.

Computer Methods and Programs in Biomedicine

|April 11, 2017

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This study developed an inexpensive computer system for optimizing liquid crystal shutter glasses to treat amblyopia (lazy eye). The system allows for precise control of shuttering parameters, improving visual stimulation for affected children.

Area of Science:

Ophthalmology
Biomedical Engineering
Computer Science

Background:

Amblyopia, or "lazy eye," affects up to 3.6% of children, causing lifelong visual impairment if untreated.
Traditional amblyopia treatments like eye patches or drops are not always effective.
Newer methods use liquid crystal shutter glasses, but lack easy individual parameter optimization.

Purpose of the Study:

Develop an inexpensive, computer-based system for liquid crystal shuttering.
Optimize shuttering parameters (wave shape, opacity, frequency, duty cycle) for amblyopic patients.
Facilitate individualized treatment for suppressed eyes in amblyopia.

Main Methods:

A liquid crystal glasses controller was developed, connected via USB to a PC.

Keywords:

Amblyopia Liquid crystal shutter Multithreading Shutter glasses Thread-safe queues

Related Experiment Videos

The system generates voltage waveforms for the glasses with interactive patient adjustments.

Multithreading programming techniques ensured precise timing for the bidirectional system.

Main Results:

The system achieved ±1Hz frequency accuracy and ±2% duty cycle accuracy for occlusion pulses.
These accuracies are satisfactory for optimizing visual stimulation with shutter glasses.
The system enables individual optimization for clinical or home use.

Conclusions:

Multithreading enhances data acquisition and instrument control.
This enables time-efficient algorithms in affordable, versatile medical devices.
The developed system offers a cost-effective solution for amblyopia treatment optimization.