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Patients with severe impairment in one eye show improved performance to defocus-induced blur

Sixteen patients (age: 33 ± 8 years) with severe visual impairment in one eye (VA equal or worse than FC at 1m), for a period longer than 2 years (10 ± 8 years), participated in the study. Only patients with an age < 50 years and monocular deprivation onset > 9 years were included (range: 9 to 42 years). Fifteen more participants (age: 28 ± 5) with normal binocular vision served as the control group. The effect of defocus, induced by positive lenses up to 2.50D, on the pattern reversal Visual Evoked Potential (VEP) and on visual  acuity (VA) was measured. VEPs were elicited using reversing 10 arcmin checks. The stimulus subtended a circular field of 7 deg with 100% contrast and 30 cd/m2 mean luminance. VA was measured using ETDRS charts. All measurements were performed at 1m viewing distance with best spectacle correction and natural  pupils. Performance of the control group was tested both monocularly (dominant eye) and binocularly. Comparisons between patient and control groups were made by fitting linear growth models using STATA 11 (xtmixed).