Table 2.

Comparing specifications of Endoscope with Eexoscope

Instrument	Endoscope	Exoscope
Working distance	3-20 mm	250-750
Field of view	Small 25 mm	Large 600 mm
Depth perception	Better	Limitation
Image type	2D/3D	2D/3D
Chance of damage to intracranial structures	Possibility	Nil
Blood obscuring the field	Does happen	Never happens
Neck position of surgeon	Neutral	Neutral
Comfort to the assistant	Yes	Yes
Operating time	Varies from case to case	Varies from case to case
Learning curve	Long	Easy
Availability	Commonly available	Few places only
Advantages	Angled view	Not possible
	Feasibility in access to small regions
Disadvantages	Blind surgical corridor	Difficult to re-position
	Use limited to some procedures