ZEISS OPHTHALMOMETER

Changing the bulb:

The bulb is under the round cover on the 
side of the instrument.  To remove the bulb 
rotate the cover until the two dots on it are 
horizontal and lift the cover off.  The blub is 
held in place by two small knurled screws.  
Loosen the screws and remove the bulb 
and its holder.  Put a new bulb in place 
being careful not to touch the glass with 
your bare fingers.  Replace the bulb and 
cover.