The tonicity of an eye drop and its dilution by tears.
D005452:Fluoresceins; D006801:Humans; D006982:Hypertonic Solutions; D009883:Ophthalmic Solutions; D009995:Osmosis; D012965:Sodium Chloride; D013666:Tears
D005452:Fluoresceins; D006982:Hypertonic Solutions; D009883:Ophthalmic Solutions; D012965:Sodium Chloride