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R. Angeli, G. Ruberto, C. Bertone, S. Pezzotta, M. Antonini, S. Signorini, E. Fazzi, P. Bianchi; Improvement of Visual Acuity and Visual Evoked Patterned Potentials Done at Different Spatial Frequencies After Rehabilitation in Children Affected by Cerebral Visual Impairment. Invest. Ophthalmol. Vis. Sci. 2008;49(13):3318.
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© ARVO (1962-2015); The Authors (2016-present)
To analyze improvement of visual acuity (VA) and visual evoked patterned potentials (pVEP) in children diagnosed by MR as cerebral visual impaired (CVI) after rehabilitation (refractive errors correction and/or occlusion therapy).
In 30 of 108 CVI affected infants presented in a previous cross-sectional study (mean age 8,1±7) we analysed the eventual VA and pVEP’s improvement after rehabilitation with refractive error correction and occlusive therapy (one year follow up). Teller Acuity Cards (TAC) and/or optotype were used to test decimal visual acuity. TAC were administrated at spatial frequencies ranging from 0.23 to 38 cycles/degrees, at a distance varying from 84 to 55 cm. VEPs were recorded at Oz, O1, O2, referenced to Fz. Five black and white checks sizes (300’,120’,60’,30’,15’) were displayed on a TV monitor screen. Each stimulation administered 64 repetitions at 1 hz frequency. At least two spatial frequencies were performed depending upon the visual function. Statistical analysis was made by means, standard deviations and p value significance.
Mean VA in decimal before treatment was 2,29, ranging from 0.4 to 7; after treatment was 3,16 ranging from 1 to 7 (p≤0.007). Mean pVEP amplitudes higher increase was found in 60’ spatial frequency (from 13.29 µv in the first control to 23.30 µv in the second) but were present also in 30’,120’. The latencies shortened meanly in the 30’ spatial frequency (from 109.66 ms in the first control to 102.37 ms in the second) but were also found in all the other spatial frequencies tested.
Our study stress the importance of the visual rehabilitation in CVI affected children for the increase of the residual visual ability.
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