Tennessee Code Title 1. Code and Statutes § 1-3-112

(a) In all statutes, rules and regulations enacted and/or promulgated by the state, its departments, agencies and institutions, wherein the term “total blindness,” that is, unable to distinguish between light and dark, is used or referred to, hereinafter, the term “legal blindness” meaning a person having not more than 20/200 with correcting glasses but with a limitation in the field of vision such that the widest diameter of the visual field subtends an angle no greater than twenty degrees (20°) shall be used.

(b) Such blindness shall be certified by a duly licensed ophthalmologist, and/or optometrist.

(c) In statutes enacted and/or rules and regulations promulgated prior to and in effect on March 17, 1961, the use of the term “total blindness” shall be construed to mean “legal blindness.”