A probabilistic approach for the estimation of angle kappa in infants
Dmitri Model, Moshe Eizenman · 2012
This paper presents a probabilistic approach for the estimation of the angle between the optical and visual axes (angle kappa) in infants. The approach assumes that when patterned calibration targets are presented on a uniform background, subjects are more likely to look at the calibration targets than at the uniform background, but it does not require accurate and continuous fixation on presented targets. Simulations results show that when subjects attend to roughly half of the presented targets, angle kappa can be estimated accurately with low probability (< 1%) of false detection. In experiments with five babies who attended to the calibration target for only 47% of the time (range from 26% to 70%), the average difference between repeated measurements of angle kappa was 0.04 ± 0.31°.