OM3C is designed for ophthalmology. It takes the stand of OM3B, have a X-Y translation machine, and it has zoom lens, that is the maximal advantage of OM3C compared with the other operation microscope. 

Specification

Eyepieces
magnification 12.5x, pupil distance adjustable range 55mm~75mm, diopter adjustment range +6D ~ -6D. Focus of second object lens 125mm

Binocular tube
high brightness 45°binocular tube
Magnification 
6:1 zoom, motorized, magnification 4.5x~27.3x; field of view Φ44~Φ7.7mm
Coaxial assistant’s binocular tube
manual 3-step changer, total magnification 6.8x,11.4x,18.2x; field of view Φ34mm,Φ20mm,Φ13mm
Coaxial illumination
illumination diameter of light spot Φ50mm, illumination intensity 60000lux
Objectives
f175mm (200mm, 250mm etc )
Focusing
motorized, range +/-25mm, speed 33s/whole distance
X-Y translator
move in X-Y direction motorised, range +/-30mm
Maximum length of arm
1130mm
New stand
swing angle of the carrier arm 0 ~300°,height from objective to floor 800mm<H<1250
Foot switch 
waterproof, 6 function steps