Advocates say it is discrimination and are arguing for "insurance fairness" on the grounds that people who have joints surgically replaced typically don't face the same kinds of coverage challenges.
A Nevada prison policy of “one eye is good enough” amounts to deliberate indifference to an inmate’s medical need for cataract surgery in violation of the Constitution, a federal appeals court held Thursday.
https://trialinsider.com/2014/08/14/one-eye-is-not-good-enough-is-bad-prison-policy/
They want to treat everyone, except their friends and families, like they are living in an unconstitutional prison.