Visual Acuity Assessment of Children with Neurological Impairment Using Grating and Vanishing Optotype Acuity Cards

R T Mackie, Kathryn Saunders, R E Day, G N Dutton, D L McCulloch

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We have compared the testability and acuity thresholds achieved with vanishing optotype acuity cards and traditional grating acuity cards when used to examine children with neurological impairment. These children encompass a wide range of ages and abilities and it may be desirable to use the two types of cards for acuity assessment. Subjects were a diverse group of children (n = 91; 8 months-19 years) whose learning ability ranged from normal to severe disability. There was no significant difference between the individual success rates for the two sets of cards (grating 91% (n = 61) vanishing optotype 89% (n = 59)). Over a wide range of acuities (0 to 2.0 LogMAR) the mean difference between acuity thresholds did not differ significantly from zero (p = 0.24). Ninety-three percent of acuity estimates agreed to within +/- 0.50 LogMAR units. The results indicate that the two acuity tests could be used interchangeably in clinical populations of children with neurological impairment.
Original languageEnglish
Pages (from-to)483-7
JournalActa ophthalmologica Scandinavica
Issue number5
Publication statusPublished - 1996


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