[Rigid endoscope with Gradient-index lenses. Preliminary studies].

Purpose: Endoscopes for use in ophthalmology can be manufactured in dimensions smaller than 0.89 mm.
Materials: Gradient-index lenses that give a higher resolution than fiber bundles can be miniaturized down to 0.35 mm.
Results: We used this new endoscope in 6 eyes of 6 patients during anterior segment surgery. Preliminary clinical experience has demonstrated the usefulness and practical application of this new instrument.
Conclusion: The clear views the instrument provides of the ciliary sulcus and ciliary body behind the iris make it useful in secondary posterior chamber intraocular lens implantation, retroprosthetic membrane behind keratoprosthesis, Molteno valve, and in endolaser photocoagulation.