Article

As part of the National Institutes of Health Toolbox initiative, we developed a
low-cost, easy-to-administer, and time-efficient test of vestibular and visual
function. A computerized test of dynamic visual acuity (cDVA) was used to measure
the difference in visual acuity between head still and moving in yaw.
Participants included 318 individuals, aged 3 to 85 years (301 without and 17
with vestibular pathology). Adults used Early Treatment of Diabetic Retinopathy
Study (ETDRS) optotypes; children used ETDRS, Lea, and HOTV optotypes. Bithermal
calorics, rotational chair, and light box testing were used to validate the cDVA.
Analysis revealed that the cDVA test is reliable for static (intraclass
correlation coefficient [ICC] >/= 0.64) and dynamic (ICC >/= 0.43-0.75) visual
acuity. Children younger than 6 years old were more likely to complete cDVA with
Lea optotypes, but reliability and correlation with ETDRS was better using HOTV
optotypes. The high correlation between static acuity and light box test scores
(r = 0.795), significant difference of cDVA scores between those with and without
pathology (p </= 0.04), and the good to excellent sensitivity (73%) and
specificity (69%) establish that the cDVA is a valid and reliable measure of
visual acuity when the head is still and moving, as well as a good proxy of
vestibular function to yaw rotation.

Langue : ANGLAIS