The relationship between scotopic visual acuity and acuity at photopic and mesopic brightness levels

Abstract

19 subjects, selected to show a wide range of scotopic acuity scores were tested with wall charts and modified Ortho-Rater targets at various photopic and mesopic brightness levels. Scotopic measures were obtained with the Army Night Vision tester. Results showed moderate relationships of scotopic and photopic acuity scores, and high relationships of scotopic and mesopic acuity scores. These results led to the conclusion that a new mesopic test to predict scotopic acuity might be practicable. (PsycInfo Database Record (c) 2025 APA, all rights reserved)