Welch Allyn's Pocket Ophthalmoscope features 48 lenses for better resolution. Six apertures for general and specialist use. Polarized filter to reduce corneal reflection. The compact Welch Allyn Pocket Ophthalmoscope is available with standard AA battery handle or optional rechargeable 2.5v ni-cad battery handle, both with pocket clip. Optional Pocketscope soft case and spare halogen bulb also available.