Relationship between optokinetic nystagmus response and recognition visual acuity

Abstract

Purpose The aim of this study was to investigate the relation between recognition visual acuity (RVA) and optokinetic nystagmus (OKN) response exhibited to different bar sizes with varying contrast. Methods OKN testing was performed in 52 children aged between 3 and 11 years. The children were evaluated in two groups according to their RVA. Group I consisted of 22 eyes with RVA equal to or better than 0.1 logMAR units. Group II consisted of 30 eyes with RVA 0.2-1 logMAR units. Each subject was seated 60 cm from the screen of Ophthimus s device, and was exposed to consecutive black and white stripes of seven different spatial frequencies (0.08-1.6 cycle/ degree). The narrowest bar that elicited OKN was identified, and then the OKN contrast threshold at this bar size was established. Results Twenty-one of the 22 eyes in Group I, and 26 of the 30 eyes in Group II exhibited 1.6 cycle/degree spatial frequency (P ¼ 0.287). In Group II, 88.9% of the 18 eyes with RVA 0.2-0.5 logMAR responded at this maximum spatial frequency, whereas the corresponding figure for the 12 eyes with RVA 0.6-1 logMAR was 83.3% (P ¼ 0.531). Contrast sensitivity (CS) significantly changed with age in Group I (P ¼ 0.006). When the eyes that responded at maximum spatial frequency in the two groups were compared, the mean CS in Group II was significantly lower than that in Group I (P ¼ 0.005). Conclusions The results indicate no relation between spatial frequency threshold for OKN response and RVA in children. However, the children with RVA deficits had significantly lower CS.

Cerebral Visual Impairment in Children

“…It has been shown in children with myopia, hyperopia or astigmatism that no systematic correlation exists between the outcome of OKN grating acuity and visual acuity for optotypes (Cetinkaya et al 2008 ). 6.2 ).…”

Similar contrast sensitivity functions measured using psychophysics and optokinetic nystagmus

“…Correlations of Snellen acuity with the highest SF that elicits OKN, range between 0.6 and 0.85 22 23 24 , although see Cetinkaya et al . 25 . Here we revisit the problem of assessing the similarity of estimates of visual function measured with OKN and perceptual report.…”

Contrast Sensitivity Testing in Healthy and Blurred Vision Conditions Using a Novel Optokinetic Nystagmus Live-Detection Method

“… 6 Although previous research focused on detecting visual acuity from OKN returned results that correlated with subjective measurements in both youth and adults, 12 , 13 the estimation of visual acuity in children using OKN reflexes did not show sufficient performance. 14 Regarding the testing of contrast sensitivity, Sangi et al 15 showed an efficient assessment of CS in children, as did Leguire et al 7 in emmetropic adults.…”