Diopter value viewing means for a video ophthalmoscope

Abstract

There is a hand-held opto-diagnostic medical system comprising a medical instrument including a housing having an optical passage through the housing and a light source for illuminating the target area. The medical instrument has a plurality of optical lenses with varying diopters fixed to one or more rotatably mounted lens selection discs which are mounted within the housing and positioned to lie in a plane perpendicular to the optical passage. The rotation of the discs sequentially disposes one or a combination of the lenses into the optical passage. The front face of the housing has a window with an indicator to display the diopter value of the lens or lenses disposed. The system further comprises an adapter coupled to the front face of the housing. The adapter has a beam splitter mechanically and optically coupled into the adapter. An optical input originates from the optical passage of the medical instrument and extends into the beam splitter, a first optical output of the beam splitter communicated to a system eyepiece positioned in the front face of the adapter, and a second optical output of the beam splitter communicated to a video camera head positioned within the adapter. By use of mirrored reflectors, such as a prism, located between the medical instrument and the adapter, the physician is able to view the diopter indicator window while the video adapter is coupled to the medical instrument.