Variations in the Slope of the Psychometric Acuity Function with Acuity Threshold and Scale

Horner, Douglas G.; Paul, Adele D.; Katz, Beverley J.; Bedell, Harold E.

doi:10.1097/00006324-198512000-00011

Cited by 17 publications

(6 citation statements)

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“…In clinical studies on adults, the slope of the psychometric function underlying visual acuity assessment has been proposed to reflect measure reliability, a steeper slope being associated with smaller confidence intervals, more accurate letter-by-letter logMAR visual acuity, 55 and better test-retest consistency. 45 Smaller confidence intervals about a threshold estimate also mean greater sensitivity to real change, 4,45 perhaps due to development, disease, or treatment.…”

Section: Performance Slopesmentioning

confidence: 99%

Grouping Effects on Foveal Spatial Interactions in Children

Waugh

Formankiewicz

2020

Invest. Ophthalmol. Vis. Sci.

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Grouping of flankers from the target can modulate crowding in adults. Visual acuity in children is measured clinically using charts with targets and different flankers to enhance spatial interactions. We investigated grouping effects on interactions using visual acuity letters, flanked by contours and letters, in children. METHODS. Visual acuity for isolated and flanked letters was measured in 155 three-to 11-year old children and 32 adults. Flankers were one stroke width from the target and were a box or four bars and black or red letters. Magnitudes of interaction were flanked minus isolated logMAR acuities. Psychometric function slopes were also examined. RESULTS. Magnitudes of interaction by contours did not change significantly with age. They were 0.047 ± 0.014 logMAR more with bars than a box. Interaction from flanking letters reduced with age, adults being not different from 9-to 11-year-olds for black and red letter surrounds. It was weaker by 0.033 ± 0.013 logMAR when a black letter was surrounded by red rather than black letters. Psychometric function slopes for visual acuity were steepest for the youngest children (3-5 years). CONCLUSIONS. For contour and letter flankers, grouping effects on interaction magnitude are age independent. Grouping bars into a box forming a single object reduces magnitude of effect. Grouping letter flankers by color and ungrouping them from the target reduce interaction magnitude by ∼8%, suggesting that luminance-defined form dominates. Differently colored letter flankers of high-luminance contrast on acuity charts could draw attention to the target but retain significant interaction strength.

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Section: Performance Slopesmentioning

confidence: 99%

Grouping Effects on Foveal Spatial Interactions in Children

Waugh

Formankiewicz

2020

Invest. Ophthalmol. Vis. Sci.

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“…The major advantage using this logMAR chart is that the inverse slope of the psychometric acuity function remains more or less independent of the acuity value. 5 An electronic version of ETDRS (e-ETDRS) was released in 2003 that was validated against the wall amounted ETDRS charts in adults 6 and children 7 between the ages of 7–12 years. M&S Technologies (Park Ridge, IL) 8 has a validated visual acuity measurement software suite with e-ETDRS protocol for assessing visual acuity using Windows desktop computers which makes it an ideal benchmark for comparison of the EyeSpy 20/20 protocol.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Reliability and Repeatability of Distance Visual Acuity Measurement with EyeSpy 20/20

Vasudevan¹,

Baker²,

Miller³

et al. 2022

OPTH

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Background Visual acuity is a critical component of visual function assessment for all ages. Standardized vision testing protocols may help prevent testing inconsistencies resulting from variations in test administration and interpretation of different examiners. However, most vision assessments outside of research settings, including in doctor’s offices, rarely employ standardized protocols. Validated protocols such as the Early Treatment for Diabetic Retinopathy Study (ETDRS) are frequently employed by vision researchers to ensure accurate and repeatable visual acuity measurements. Methods This study evaluates a desktop-based standardized vision testing algorithm (EyeSpy 20/20) specifically designed for use on mobile electronic platforms. Subjects were tested on a desktop version of the EyeSpy software for both the accuracy and duration of measurement of visual acuity and compared to a e-ETDRS chart in a randomized sequence. Children were recruited for this study and tested between two different visual acuity measurement systems. Bland–Altman analysis and correlation tests were done. Results Hundred and ten children were recruited for the study. The EyeSpy 20/20 visual acuity testing algorithm as tested with the desktop version was non-inferior to the gold standard e-ETDRS testing algorithm on a desktop platform, but statistically faster to implement when administered on the same electronic testing platform. Conclusion EyeSpy 20/20 is a promising tool for vision screening and visual acuity evaluation in children.

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“… 24 , 25 We cannot meaningfully compare VA scores from patients with different VA range parameters or interpret changes of VA scores of the same patient with range parameter changing between assessments. 18 , 19 …”

Section: Introductionmentioning

confidence: 99%

Quantifying Uncertainty of the Estimated Visual Acuity Behavioral Function With Hierarchical Bayesian Modeling

Zhao

Lesmes

Dörr

et al. 2021

Trans. Vis. Sci. Tech.

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Purpose The goal of this study is to develop a hierarchical Bayesian model (HBM) to better quantify uncertainty in visual acuity (VA) tests by incorporating the relationship between VA threshold and range across multiple individuals and tests. Methods The three-level HBM consisted of multiple two-dimensional Gaussian distributions of hyperparameters and parameters of the VA behavioral function (VABF) at the population, individual, and test levels. The model was applied to a dataset of quantitative VA (qVA) assessments of 14 eyes in 4 Bangerter foil conditions. We quantified uncertainties of the estimated VABF parameters (VA threshold and range) from the HBM and compared them with those from the qVA. Results The HBM recovered covariances between VABF parameters and provided better fits to the data than the qVA. It reduced the uncertainty of their estimates by 4.2% to 45.8%. The reduction of uncertainty, on average, resulted in 3 fewer rows needed to reach a 95% accuracy in detecting a 0.15 logMAR change of VA threshold or both parameters than the qVA. Conclusions The HBM utilized knowledge across individuals and tests in a single model and provided better quantification of the uncertainty of the estimated VABF, especially when the number of tested rows was relatively small. Translational Relevance The HBM can increase the accuracy in detecting VA changes. Further research is necessary to evaluate its potential in clinical populations.

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Variations in the Slope of the Psychometric Acuity Function with Acuity Threshold and Scale

Cited by 17 publications

References 0 publications

Grouping Effects on Foveal Spatial Interactions in Children

Grouping Effects on Foveal Spatial Interactions in Children

Analysis of the Reliability and Repeatability of Distance Visual Acuity Measurement with EyeSpy 20/20

Quantifying Uncertainty of the Estimated Visual Acuity Behavioral Function With Hierarchical Bayesian Modeling

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