Effect of Luminance and Contrast Variation on Stereoacuity Measurements Using Smartphone Technology

Area of Science:

• Ophthalmology
• Visual Science
• Human Factors Engineering

Background:

• Traditional printed stereoacuity tests have limitations.
• The impact of luminance and contrast on stereopsis is crucial for electronic display design but insufficiently studied.

Purpose of the Study:

• To investigate the effects of varying luminance and contrast on stereopsis.
• To evaluate the feasibility of using smartphones for stereoacuity testing.

Main Methods:

• A stereopsis measurement system was developed using 4K smartphones and a phoropter.
• Seventeen participants with normal vision were tested with contour-based and random-dot-based symbols.
• Tests varied in luminance (240-30 lux) and contrast (95%-5%).

Main Results:

• No significant differences in stereopsis were found between symbol types across varying luminance and contrast levels.
• Stereopsis remained comparable for both patterns above 35% contrast.
• Contour-based patterns showed significantly better stereopsis than random-dot patterns below 30% contrast.

Conclusions:

• Digital display luminance and contrast are not critical factors for stereoacuity under typical conditions.
• Standard monitors with 3D technology can be used for stereoacuity threshold measurement without calibration.
• This research aids in developing accessible electronic stereoacuity testing devices.