Vision Testing in Patients With Partial Seizures Receiving Either Lyrica or Placebo

Change From Baseline in Mean Deviation Score From Humphrey Threshold Test at Week 12 or Early Termination

Mean deviation (MD) is a global index of visual field depression. The MD ranges from 0 decibels (no defect) to about -32 decibels (end-stage damage), higher scores indicate worse condition. It is derived from the Humphrey 24-2 SITA standard visual field analyzer. Change in mean deviation score from baseline to Week 12 or termination was computed for each participant. As planned, for each participant, the worst eye (eye with the greatest decrease in mean deviation) was used in the analysis and data is reported for same.

Time frame: Baseline, Week 12 or Early Termination (any time up to Week 12)

Change From Baseline in Visual Acuity at Week 12 or Early Termination

Visual acuity best-corrected (with glasses or best possible glasses prescription) was measured using early treatment diabetic retinopathy study (ETDRS) charts. There were 2 ETDRS charts. The letters on chart A were read using the right eye and on chart B using the left eye. The participants started from the top of the chart to down. The participants read down the chart until they reached a row where a minimum of 3 letters on a line could not be read. The participants were scored by number of letters identified correctly. Range was from 0 to 70, with higher scores indicate better visual acuity. As planned, for each participant, the worst eye (eye with the greatest decrease in visual acuity) was used in the analysis and data is reported for same.