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Bifocals in children with Down syndrome (BiDS) – visual acuity, accommodation and early literacy skills
Author(s) -
Nandakumar Krithika,
Leat Susan J.
Publication year - 2010
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2010.01944.x
Subject(s) - accommodation , medicine , visual acuity , optometry , audiology , perception , psychology , ophthalmology , developmental psychology , neuroscience
Acta Ophthalmol. 2010: 88: e196–e204 Abstract. Purpose: Reduced accommodation is seen in children and young adults with Down syndrome (DS), yet providing bifocals has not become a routine clinical management. This study investigates the impact of bifocals on visual function, visual perceptual and early literacy skills in a group of school children with DS. Methods: In this longitudinal study, each child was followed for 5 months with single‐vision (SV) lenses after which bifocals were prescribed if required, based on their accommodative response. Visual acuity (VA), accommodation, perceptual and literacy skills were measured after adaptation to bifocals and 5 months later. Educational progress and compliance with spectacle wear were assessed through school and parental reports. Results: Fourteen children and young adults with DS participated in the study. Eighty‐five percent required bifocals with additions ranging from +1.00 D to +3.50 D. The mean near logMAR VA improved with bifocals (p = 0.007) compared to SV lenses. Repeated measures anova showed that there was more accurate focus (less accommodative lag) through the bifocals (p = 0.002), but no change in the accommodation exerted through the distance portion compared to SV lenses (p = 0.423). There was a main effect of time on sight words (p = 0.013), Word Identification (p = 0.047), Visual Closure (p = 0.006) and Visual Form Constancy (p = 0.001). Conclusion: Bifocals provide clearer near vision in DS children with reduced accommodation. This is shown by improved VA and decreased lag of accommodation. The results indicate that the improvement in VA results in improved scores in early literacy skills. Better compliance with bifocals over SV lenses was seen.