title: A hand-held, two-channel stimulator-ophthalmoscope.
abstract: A hand-held optical system for presenting focused stimuli on known retinal areas by direct ophthalmoscopy is described. The optical system provides a time-modulated stimulus beam of variable dimension, retinal illuminance, wave-length, and polarization, and a steady background beam of variable retinal illuminance and wavelength. Both beams enter the patient's eye in maxwellian-view for precise control of the ratio of stimulus to background retinal illuminance. The stimulator-ophthalmoscope allows the examiner to compensate easily for variable fixation.
mesh_terms: D002648:Child; D005128:Eye Diseases / Q000175:diagnosis*; D006801:Humans; D008875:Middle Aged; D019721:Ophthalmoscopes; D010775:Photic Stimulation / Q000295:instrumentation*