Accommodative Stimulus-Response Curve with Emoji Symbols

Purpose. to evaluate the static measurement of the accommodative stimulus-response curve with emoji symbols. methods. the accommodative stimulus-response curve was measured in 18 subjects using a hartmann-shack sensor to obtain the objective accommodative response from the zernike defocus term. measurements were acquired at different accommodative demands,from 0 to 3 d with a step of 0.5 d. detailed and nondetailed emoji targets were used with two different sizes,corresponding to the two most common visual angles used in smartphones. results. a regression analysis was performed to fit the mean results obtained for each target. the determination coefficient was r2≥0.988 for all targets. for the detailed targets,the slopes for the averaged stimulus-response curve were 0.65 and 0.66 for the bigger and smaller sizes,respectively. for the nondetailed targets,the slopes were 0.60 and 0.58 for the bigger and smaller sizes,respectively. p values for these slopes were statistically significant for the two types of targets (p<0.01). conclusions. our results reveal that the replacement of a word or several words by detailed or nondetailed emoji symbols seems not to provoke a different accommodative response in normal subjects and under standard viewing conditions in the use of smartphones. © 2017 robert montés-micó et al.