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The spectral, spatial and contrast sensitivity of human polarization pattern perception
Gary P Misson1,2, Stephen J Anderson3
1Department of Ophthalmology, South Warwickshire NHS Foundation Trust, Warwick Hospital, Lakin Road, Warwick, CV34 5BW, UK. garypmisson@gmail.com.
Scientific Reports
|November 30, 2017
Summary
Human polarization perception relies on macular pigment, enabling visual assessment of macular function. This study quantifies polarization sensitivity, revealing its link to macular pigment and potential for diagnosing eye conditions.
Area of Science:
- Vision Science
- Neuroscience
- Ophthalmology
Background:
- Human perception of linear polarized light is thought to involve conversion to luminance signals by macular structures.
- Polarization sensitivity measures may offer a method for assessing macular function.
Purpose of the Study:
- To quantify the psychophysical characteristics of human polarization perception.
- To investigate the role of macular structures in polarization sensitivity.
- To explore the potential diagnostic applications of polarization perception.
Main Methods:
- Utilized grating and optotype stimuli defined by linear polarization state.
- Measured polarization sensitivity across the visual field.
- Assessed discrimination thresholds for electric field vector orientation.
Main Results:
- Polarization sensitivity correlates with macular pigment spectral sensitivity and density.
- Identified polarization patterns across various contrasts and scales, with an acuity of 15.4 cycles/degree (0.29 logMAR).
- Discrimination of polarization orientation differences as low as 4.4° was achieved.
Conclusions:
- Findings support the macular diattenuator model of polarization sensitivity.
- Human polarization pattern recognition is unique among vertebrates and comparable to some invertebrates.
- This sensory modality extends beyond simple phenomena like Haidinger's brushes.
- Macular-based polarization perception is a promising tool for detecting and quantifying macular dysfunction.
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