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The aim of the study was to compare the results of the smiley face and the girl's face to estimate an appropriate TRL with that of the Bjerrum tangent screen.
Perimetry was performed using a 1-meter Bjerrum tangent screen to map the border of the participant's central scotoma and blind spot.
Tangent screen perimetry was performed using the smallest white stimulus that the participant could see, ranging from 1 to 7 millimeters (about 0.