Measuring visual acuity in children using preferential looking and sine wave cards.
Preferential looking using square waves is commonly used to measure visual acuity of infants. Since sine-wave gratings have the advantage of presenting only a single spatial frequency, we completed a study to develop and validate a set of acuity cards using sine waves. The subjects were 83 children (mean age = 41.5 months, range = 3 to 69 months). The sine-wave cards were compared with Teller cards. Identical visual acuity was determined in 83% of the cases. Wilcoxon non-parametric analysis provided no evidence to reject the null hypothesis of equal visual acuities between the two methods. We conclude that sine-wave cards may be used to measure the preferential looking acuity of children.
Jackson
G R
GR
School of Optometry, Medical Center, University of Alabama, Birmingham.
Jessup
N S
NS
Kavanaugh
B L
BL
Moats
V L
VL
Daum
K M
KM
Marsh-Tootle
W L
WL
Rutstein
R P
RP
D002648:Child; D002675:Child, Preschool; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D015203:Reproducibility of Results; D015351:Vision Screening / Q000379:methods; D014787:Vision Tests / Q000295:instrumentation / Q000379:methods*; D014792:Visual Acuity