| 摘要 |
An indirect ophthalmoscope consists of a single unit incorporating a light source 5, collimating lens 6, and a beam splitter 7 reflecting the light through a lens 8 serving as a projection lens and a viewing lens. The user views the aerial image produced by the lens 8, through a viewing window 13 close to the image plane. The light source and collimating lens are mounted in a handle 4. The ophthalmoscope can be used with an infra-red image converter for infra-red examination. <IMAGE> |
