. "(optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point"@en-us . . . "113147735"@en-us . . . "113938663"^^ . . . . . . . . . . . . "0"^^ . . . "13938663-n"^^ . . . "110043572"@en-us . "0"^^ . . . . "stigmatism"^^ . . . . . . . "stigmatism"@en-us . "(optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point"@en-us . . .