[Dichromic filters: (1) replacing the cobalt blue lens; (2) permitting entoptic perception of the macula].
D003035:Cobalt; D004864:Equipment and Supplies; D006801:Humans; D008266:Macula Lutea; D009885:Ophthalmology / Q000600:supply & distribution*
D003035:Cobalt
OPHTHALMOLOGY/equipment and supplies