![]() ![]() This parameter can also be used as a clinical landmark to aid in the identification of impairments in accommodation and near-point convergence , as well as other vision issues . Obtaining an accurate IPD measurement is crucial, as it allows for proper alignment of the visual axis of the eye with the optical center of the lens. The interpupillary distance (IPD), also known as the pupillary distance, is the distance between the centers of the pupillary light reflexes of both eyes . Of the three smartphone applications compared in this study, the Warby Parker application performed to the highest degree of accuracy and may serve as an adequate alternative when conventional IPD measurement methods are either unavailable or unable to be performed accurately. The Warby Parker application most frequently obtained accurate IPD measurements within the following ranges: ± 0.05 mm, ± 0.10 mm, ± 0.25 mm, ± 0.50 mm, ± 0.75 mm, and ± 1.00 mm. The Eye Measure (Dotty Digital, Sydney, New South Wales, Australia) and Warby Parker (Warby Parker, New York, New York) applications had significantly lower MAE of IPD measurements (0.511364 mm) compared to the PDCheck AR (EyeQue Corp., Newark, California) application (1.375 mm). Additionally, the frequency at which each application measured IPD within ± 0.05 mm, ± 0.10 mm, ± 0.25 mm, ± 0.50 mm, ± 0.75 mm, and ± 1.00 mm of the digital pupilometer measurement was determined. The mean absolute error (MAE) of IPD prediction by each application was compared. This study compared measurements from three smartphone applications to measurements obtained by a single trained examiner using a digital pupilometer in 44 subjects. To determine the accuracy of three smartphone applications in the measurement of interpupillary distance (IPD). ![]()
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