“G-Day” programs frequently have been employed lo detect previously undiagnosed cases of glaucoma. Often, such programs have used elevated intraocular pressure as (heir sole basis for referral. The results of one such voluntary program have provided data which suggest the following: (I) The incidence of previously-undiagnosed glaucoma (for an overall sample of 2.244 persons) was probably about 1.3%: (2) Public participation appears to have been greatest among those approaching retirement age. being substantially less among both those of early middle age and those well past normal retirement age; (3) The percentage of referrals varied little from community to community; (4) The percentage of referrals varied only slightly from one general age level to another; (5) Among those referred for complete glaucoma workups, the frequency with which “clean bills of health” were obtained declined markedly with advancing age; and, (6) An unequivocal diagnosis of glaucoma was found to be less common among elderly screenees than among those of advanced middle age.