The Mind Cannot Go Blind: Effects of Central Vision Loss on Judging One's Crossing Time.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
Madeline Graber, Shirin E Hassan

Abstract

This study explored whether people with AMD can accurately judge the time they need to cross the street. The results suggest that AMD-related vision loss does not affect a person's ability to estimate his/her own street-crossing time, whereas familiarity with the street does. The purpose of this study was to assess whether people with AMD could judge accurately their street-crossing time. Fifty-one AMD subjects and 47 age-matched normally sighted subjects (controls) estimated their time to cross a single-lane, one-way street four times (pre-estimate). Then, subjects actually crossed the street four times and subsequently estimated their crossing time four additional times (post-estimate). A linear mixed model with repeated measures for subject was used to determine if the ratio between subjects' estimated and actual crossing times changed as a function of subject group (AMD vs. control) and whether estimates changed before and after actually crossing the street. Univariate correlations and multiple regression analyses were also performed to determine which of the measured experimental variables were the best predictors of a subject's ability to estimate his/her crossing time. No significant difference in crossing ratios were fo...Continue Reading

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