Variability of Vernier acuity measurements in untrained subjects of different ages

Abstract

The Vernier acuity of 50 normal untrained subjects (20 males and 30 females) was measured by the method of adjustment. Subjects were divided into five age ranges with 10 subjects in each age group: 5-10, 11-20, 21-30, 31-40, and 41-50 years. All subjects had normal visual acuity (20/20) and volunteered to participate in the experiment. Children were selected from a local school and adults recruited from the technical staff of the Department of Ophthalmology of the School of Medicine. Vernier acuity was higher in adults compared to children. Intraindividual variability was high and it was estimated that for most individuals of all age groups a range of 100 to 700 trials was necessary to obtain a mean with a precision of 10%. These results suggest that Vernier acuity variability is an obstacle to its use in clinical settings.

Exploring the Within-Person Coupling of Reading Vision and Cognition in the Elderly

“…This type of design allowed for the parsing of the within-and betweenperson variance in occasion reading vision, in addition to the coupling relationship between reading vision and cognitive performance. Although previous research examining intraindividual variability in vision is limited, the results are similar to what has been found in the literature (e.g., Abbud & Cruz, 2002;Fisher & Carr, 1970). Specifically, we observed that a substantial amount of variability in occasion reading vision is due to the within-person variation.…”

“…It is also possible that a one time assessment of vision might not be very reliable. In fact research has shown that vision does fluctuate over relatively short periods of time (Abbud & Cruz, 2002;Fisher & Carr, 1970).…”

“…One other study administered, on average, 500 assessments of visual acuity, during one testing session (Abbud & Cruz, 2002). Participants included in the study were between the ages of 5 and 50 years old and were all identified as having near perfect (20/20) vision.…”

“…The second aim was to determine the amount of within-person and between-person variability in occasion reading vision. Given the variability in reading vision over a 24-h period (Abbud & Cruz, 2002), it was expected that bi-daily assessments over the course of 60 days would also reveal substantial intraindividual variability in elders' occasion reading vision assessments. The third aim was to examine the within-person relationship, or coupling, between occasion reading vision and cognitive functioning.…”

Eye tracking-based estimation and compensation of chromatic offsets for multi-wavelength retinal microstimulation with foveal cone precision

“…In the subjective validation experiment, participants made an average error of 0.30 arcmin, corresponding to twice the objectively determined precision, and smaller than the expected Nyquist limit of 0.43 arcmin for a foveal cone density of 200,000 cells/mm2 [36], but slightly higher than the typically found average Vernier acuity of 0.19 arcmin [37] and 0.25 arcmin [38]. Because we did not observe any systematic displacements across the three participants, we conclude that the subjective validation confirmed the current calibration process.…”