title: A comparison of four projection perimeters. Instrument specifications.
abstract: In addition to the original and highly popular instrument designed by Goldmann, three other projection perimeters are now available. Features of the Goldmann, Topcon, Marco and Rodenstock machines are examined and compared.
mesh_terms: D006801:Humans; D008029:Lighting; D058609:Visual Field Tests / Q000295:instrumentation