Contrast SensitivityVisual PathwaysPattern Recognition, VisualPhotic StimulationEsotropiaVisual CortexElectroretinographyMotion PerceptionVisual AcuityReaction TimeVision DisordersAlbinism, OcularAmblyopiaColor PerceptionVision, BinocularPsychophysicsStrabismusOptic NeuritisOptic NerveOptic Nerve DiseasesElectroencephalographySensory ThresholdsVisual FieldsMultiple SclerosisVision, OcularVisual PerceptionRetinaAgingMagnetic Resonance ImagingTime Factors