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Subnormal visual perception in school-aged ex-preterm patients in a paediatric eye clinic
A-L Hård1, E Aring, A Hellström
1Department of Ophthalmology, Institute of Clinical Neuroscience, The Queen Silvia Children's Hospital, The Sahlgrenska Academy of Göteborg University, Gotheburg, Sweden. annalena.hard@oft.gu.se
Purpose:
The aim of this study was to assess visual perception at school age of children born preterm with known lesions to the posterior visual pathways or with ophthalmologic signs that might indicate such lesions.
Methods:
The study group consisted of 91 patients born before the 37th gestational week. Visual perception was assessed using the TVPS-R (Test of Visual Perceptual Skills - Revised) and a structured interview. In addition, ophthalmologic and orthoptic examinations were performed.
Results:
On the test of visual perception, 67% of the patients had results below the third percentile of the American reference group. This is to be compared with 10% of Swedish full-term controls. Scores below the third percentile were observed in 87% of the patients with known brain lesions, 48% of those with strabismus without known brain lesion, and 86% of those with reduced visual acuity in the absence of strabismus and known brain lesion.
Conclusions:
Reduced visual perception is common among children born preterm who have strabismus and/or reduced visual acuity, as well as in those with known brain lesions. This study emphasises the need to find tools to identify and assess those patients who have visual perceptual problems that may restrict their ability to meet the demands of daily life.