2020 Volume 37 Issue 2 Pages 147-153
Purpose: To investigate photometric harmony with pupil perimetry in healthy adults.
Methods: We included 21 right eyes of 21 healthy adults (mean age, 20.6±0.5 years) . Pupillary light reflexes were measured based on the pupil perimeter using a device produced experimentally by the Kawasaki University of Medical Welfare. Light stimuli had five levels of intensity (area×luminance) , which were paired with the same intensity but at different areas (2° to 16°) and luminance (1 to 16 cd/m2) . Stimuli sites were positioned at five points (45°, 135°, 225°, and 315°) with eccentricities of 0° and 15°. The pupillary contraction ratio (PCR) was measured to evaluate the pupillary light reflex.
Results: At each stimulus site, PCR showed a logarithm of intensity and linear regression (R2 > 0.9) . When using stimuli of the same intensity, PCRs with an eccentricity of 0° were greater than PCRs with an eccentricity of 15°. PCR did not differ between pairs of same intensities at any stimulus site (p＞0.05) .
Conclusions: In the central visual field with an eccentricity of 15° or less, photometric harmony with pupil perimetry was observed using light stimuli of the same intensity.
