5 U.S.C. § 8986: Election of coverage

An eligible individual may enroll in a vision benefits plan for self-only, self plus one, or for self and family. If an eligible individual has a spouse who is also eligible to enroll, either spouse, but not both, may enroll for self plus one or self and family. An individual may not be enrolled both as an employee, annuitant, or other individual eligible to enroll and as a member of the family. an eligible individual may enroll in a vision benefits plan; and an enrolled individual may change the self-only, self plus one, or self and family coverage of that individual. before the start of any contract term in which there is a change in rates charged or benefits provided, in which a new plan is offered, or in which an existing plan is terminated; or during other times and under other circumstances specified by the Office. A transfer under paragraph (1) shall be subject to waiting periods provided under a new plan. Coverage under a vision benefits plan under this chapter for any employee or a covered TRICARE-eligible individual enrolled in such a plan and who, as a result of a lapse in appropriations, is furloughed or excepted from furlough and working without pay shall continue during such lapse and may not be cancelled as a result of nonpayment of premiums or other periodic charges due to such lapse.