Deafblindness What is Deafblindness?Wisconsin’s definition of deafblindness. Eligibility for ServicesEligibility Chart for WDBTAP Services (English & Spanish) Considering WDBTAP ServicesChecklist to Consider WDBTAP Supports and Services (English & Spanish) Deafblind Child CountWisconsin Deafblind Child Count Deaf-Blindness OverviewLearn about deafblindness from the National Center on Deaf-Blindness. Causes of DeafblindnessCommon, but rare syndromes and prenatal/congenital causes.