New Jersey Statutes Title 54. Taxation 54 § 4-3.34

A person shall be deemed to have “total blindness,” as used in this act, when the vision in his better eye with proper correction does not exceed 20/200 as measured by Snellen chart or when there is a field defect in his better eye with proper correction in which the peripheral field has contracted to such an extent that the widest diameter of visual field subtends an angular distance no greater than twenty degrees.