In a person up to the age of 21 years, a severe (71-90 decibels) hearing loss or profound bilateral sensori-neural hearing loss
In a person up to the age of 21 years, a severe vision impairment with visual acuity of 6/36 or beyond after best possible correction, or a loss restricting the field of vision to 15-20 degrees
In a person up to the age of 21 years, a severe physical disability, where they are unable to stand and walk without support, and cannot independently dress, eat, hold a cup, or maintain their stability when sitting.
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http://www.immigration.govt.nz/NR/rdonlyres/EDE93E50-160B-4732-8713-2181A340F91F/0/Appendices.pdfMedical is Chapter 10.