Compact vision testing apparatus is provided for testing a relatively large number of physiological characteristics of the eyes and visual system of a human subject. The head of the subject is inserted into a viewing port at one end of a light-tight housing containing various optical assemblies. Visual acuity and other refractive characteristics and ocular muscle balance characteristics of the eyes of the subject are tested by means of a retractable Phoroptor assembly carried near the viewing port and a film cassette unit carried in the rearward portion of the housing, the latter selectively providing a variety of different visual targets which are viewed through the optical system of the phoroptor assembly. Various Maddox rod, Risley prism, occluder, lens and other optical devices are carried by the Phoroptor for selective positioning before one or both of the eyes of the subject. A multi-positional partially-retractable field mapping assembly is located within the forward end of the housing for mapping the visual field of the subject along different meridian lines, both with a white test object and with test objects of different colors. The visual dark adaptation characteristics and absolute brightness threshold of the subject are tested by means of a projector assembly which selectively projects one or both of a variable intensity fixation target and a variable intensity adaptation test field onto a viewing screen located near the top of the housing. A system of retractable mirrors is provided at the forward end of the housing for enabling the subject to observe this viewing screen. The film cassette unit is carried by an inner box assembly which also carries a Dolman rod unit for testing the visual depth perception of the subject. Such inner box assembly is provided with an elevator mechanism so that either the film cassette unit or the Dolman rod unit can be positioned in line with the eyes of the subject. A mechanism is also provided for testing the visual critical fusion frequency of the subject.
Multiparameter vision testing apparatus